Reference Open Diagrams via Coend Calculus [roman-optics-coend]

 @article
{roman-optics-coend, title={Open Diagrams via Coend Calculus}, volume={333}, ISSN={2075-2180}, DOI={10.4204/EPTCS.333.5}, journal={Electronic Proceedings in Theoretical Computer Science}, author={Román, Mario}, year={2021}, month={Feb}, pages={65-78},language={en} }