• Pawar et al 2017 - Relation Extraction : A Survey Very good survey
• Smirnova & Cudre-Mauroux 2018 - Relation Extraction Using Distant Supervision: A Survey
• Zhang et al 2020 - A Survey Deep Learning Based Relation Extraction

• Miwa & Bansal 2016 - End-to-End Relation Extraction using LSTMs on Sequences and Tree Structures

For an overview see section 6 of this paper.

• Banko et al 2007 - Open Information Extraction from the Web The paper that introduced the task of OpenIE. Their system was called TextRunner. Precurser to NELL? Their design is very similar, see this paper.
• Lockard et al 2019 - OpenCeres: When Open Information Extraction Meets the Semi-Structured Web

• Information Extraction