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Introduction of ER Model - GeeksforGeeks
Entity-Relationship Diagram Symbols and Notation - Lucidchart
A Guide to the Entity Relationship Diagram (ERD) - Database Star
Guide to entity-relationship diagram notations & symbols - Gleek
Entity Relationship (ER) Diagram Symbols: A Quick Guide - Miro
Entity Relationship (ER) diagrams guide - nulab.com
Demystifying ER Diagram Symbols: A Comprehensive Explanation