Challenge: Existing systems struggle to copy and properly cite unstructured evidence, which also tends to be “lost-in-the-middle”.
Approach: They propose to extract unstructured evidence spans to improve the trustworthiness of large language models by citing unstructure . they propose to use this dataset as a training supervision for unstructure-based evidence summarization.
Outcome: The proposed pipeline generates more relevant and factually consistent evidence than baselines with no fine-tuning and fixed granularity evidence.

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Attribution, Citation, and Quotation: A Survey of Evidence-based Text Generation with Large Language Models (2026.acl-long)

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Challenge: Recent advances in large language models have raised concerns about reliability and trustworthiness of the models.
Approach: They analyze 134 papers and introduce a taxonomy of evidence-based text generation with LLMs.
Outcome: The proposed methods highlight open challenges and outline promising directions for future work.
Semantic Span Annotation: An Exploratory Study of LLM Annotation (2026.acl-srw)

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Challenge: Structured span extraction research is siloed by context length, annotation task, and domain . Identifying a span within a natural language text and affixing it with a semantic label has been considered a core task in NLP .
Approach: They propose a framework for structured span annotation that integrates five datasets under a common JSONL format with character-level offsets.
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StructSum: Summarization via Structured Representations (2021.eacl-main)

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Challenge: Abstractive summarization models overfit to training corpora, lack of transparency and layout bias . authors propose incorporating latent and explicit dependencies across sentences in source document .
Approach: They propose a framework based on document-level structure induction to address layout bias and lack of transparency in abstractive summarization models.
Outcome: The proposed framework improves coverage of content in the source documents and generates more abstractive summaries by generating more novel n-grams.
Enhancing Incremental Summarization with Structured Representations (2024.findings-emnlp)

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Challenge: Large language models struggle with processing extensive input contexts, leading to redundancy or incoherency.
Approach: They propose a chain-of-key update based on JSON structured memory representations to improve summarization performance by 40% and 14% on two public datasets.
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Low-Perplexity LLM-Generated Sequences and Where To Find Them (2025.acl-srw)

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Challenge: Large Language Models (LLMs) are increasingly applied across various domains, but the ways they leverage their training data during inference remains only partially understood.
Approach: They propose a systematic approach that analyzes low-perplexity sequences and traces them back to their sources in the training data.
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Inducing Document Structure for Aspect-based Summarization (P19-1)

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Challenge: Abstractive summarization systems treat documents as unstructured and generate a single generic summary per document.
Approach: They propose to incorporate document structure into automatic summarization systems . they induce latent document structure and abstractive summarizing objective .
Outcome: The proposed model improves on topic-agnostic baselines and can produce abstractive and extractive aspect-based summaries.
UniSumEval: Towards Unified, Fine-grained, Multi-dimensional Summarization Evaluation for LLMs (2024.findings-emnlp)

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Challenge: Existing benchmarks for summarization quality evaluation lack diverse input scenarios, focus on narrowly defined dimensions, and struggle with subjective and coarse-grained annotation schemes.
Approach: They propose to use AI to help human annotations and identifie potentially hallucinogenic input texts.
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Logic Haystacks: Probing LLMs’ Long-Context Logical Reasoning (Without Easily Identifiable Unrelated Padding) (2026.eacl-short)

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Challenge: Recent large language models claim long context windows, but evaluations often involve simple retrieval tasks or synthetic tasks padded with irrelevant text.
Approach: They use grammars to generate simplified English with logical representations to create long input text while controlling its semantics.
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Arg-LLaDA: Argument Summarization via Large Language Diffusion Models and Sufficiency-Aware Refinement (2026.acl-long)

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Challenge: Existing approaches to argument summarization rely on single-pass generation, offering limited support for factual correction or structural refinement.
Approach: They propose a large language diffusion framework that iteratively improves argument summarization by sufficiency-guided remasking and regeneration.
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Drilling Down into the Discourse Structure with LLMs for Long Document Question Answering (2023.findings-emnlp)

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Challenge: Long document question answering requires locating relevant paragraphs within a document to answer a question.
Approach: They propose to exploit the discourse structure commonly found in documents to create a condensed representation of the document, enabling a more comprehensive understanding and analysis of relationships between different parts.
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