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        <title>LeCoPCR: Legal Concept-guided Prior Case Retrieval for European Court of Human Rights cases</title>
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    <abstract>Prior case retrieval (PCR) is crucial for legal practitioners to find relevant precedent cases given the facts of a query case. Existing approaches often overlook the underlying semantic intent in determining relevance with respect to the query case. In this work, we propose LeCoPCR, a novel approach that explicitly generate intents in the form of legal concepts from a given query case facts and then augments the query with these concepts to enhance models understanding of semantic intent that dictates relavance. To overcome the unavailability of annotated legal concepts, We employ a weak supervision approach to extract key legal concepts from the reasoning section using Determinantal Point Process (DPP) to balance quality and diversity. Experimental results on the ECtHR-PCR dataset demonstrate the effectiveness of leveraging legal concepts and DPP-based key concept extraction.</abstract>
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%0 Conference Proceedings
%T LeCoPCR: Legal Concept-guided Prior Case Retrieval for European Court of Human Rights cases
%A T.y.s.s, Santosh
%A Nolasco, Isaac Misael Olguín
%A Grabmair, Matthias
%Y Chiruzzo, Luis
%Y Ritter, Alan
%Y Wang, Lu
%S Findings of the Association for Computational Linguistics: NAACL 2025
%D 2025
%8 April
%I Association for Computational Linguistics
%C Albuquerque, New Mexico
%@ 979-8-89176-195-7
%F t-y-s-s-etal-2025-lecopcr
%X Prior case retrieval (PCR) is crucial for legal practitioners to find relevant precedent cases given the facts of a query case. Existing approaches often overlook the underlying semantic intent in determining relevance with respect to the query case. In this work, we propose LeCoPCR, a novel approach that explicitly generate intents in the form of legal concepts from a given query case facts and then augments the query with these concepts to enhance models understanding of semantic intent that dictates relavance. To overcome the unavailability of annotated legal concepts, We employ a weak supervision approach to extract key legal concepts from the reasoning section using Determinantal Point Process (DPP) to balance quality and diversity. Experimental results on the ECtHR-PCR dataset demonstrate the effectiveness of leveraging legal concepts and DPP-based key concept extraction.
%R 10.18653/v1/2025.findings-naacl.89
%U https://aclanthology.org/2025.findings-naacl.89/
%U https://doi.org/10.18653/v1/2025.findings-naacl.89
%P 1654-1661

Markdown (Informal)

[LeCoPCR: Legal Concept-guided Prior Case Retrieval for European Court of Human Rights cases](https://aclanthology.org/2025.findings-naacl.89/) (T.y.s.s et al., Findings 2025)

• LeCoPCR: Legal Concept-guided Prior Case Retrieval for European Court of Human Rights cases (T.y.s.s et al., Findings 2025)

ACL

• Santosh T.y.s.s, Isaac Misael Olguín Nolasco, and Matthias Grabmair. 2025. LeCoPCR: Legal Concept-guided Prior Case Retrieval for European Court of Human Rights cases. In Findings of the Association for Computational Linguistics: NAACL 2025, pages 1654–1661, Albuquerque, New Mexico. Association for Computational Linguistics.