@book{hinze-2023-introducing, title={Introducing String Diagrams: The Art of Category Theory}, ISBN={9781009317863}, url={http://dx.doi.org/10.1017/9781009317825}, DOI={10.1017/9781009317825}, publisher={Cambridge University Press}, author={Hinze, Ralf and Marsden, Dan}, year={2023}, month=July }