# Reference

1. [PROGRAM DESIGN BY CALCULATION](http://www4.di.uminho.pt/~jno/ps/pdbc.pdf)
1. [A Short Skinny on Relations & the Algebra of Programming](http://www.philipzucker.com/a-short-skinny-on-relations-towards-the-algebra-of-programming/)
1. [Tensorial logic: A primitive logic of tensor and negation](https://www.irif.fr/~mellies/tensorial-logic.html)
1. [Introduction to Theoretical Computer Science](https://introtcs.org/public/index.html)