State Schema Evolution, The Apache Flink Community, 2024 (Apache Software Foundation) - Official guide to Flink's state schema evolution, including serializer snapshots, POJO rules, Avro integration, and the State Processor API.
Apache Avro Specification - Schema Resolution, The Apache Avro Project, 2023 (The Apache Software Foundation) - Details how Avro handles schema evolution and compatibility, which is essential for Flink applications using Avro serializers.