https://www.semanticscholar.org/paper/Fun-with-semirings%3A-a-functional-pearl-on-the-abuse-Dolan/2e43477e26a54b2d1a046c214055faee7ebc3544 https://www.semantics

https://www.semanticscholar.org/paper/Fun-with-semirings%3A-a-functional-pearl-on-the-abuse-Dolan/2e43477e26a54b2d1a046c214055faee7ebc3544 https://www.semanticscholar.org/paper/Fun-with-semirings%3A-...