@article{blackwell_kelly_power_1989,
 title = {Two-dimensional monad theory},
 author = {Blackwell, R. and Kelly, G. M. and Power, A. J.},
 year = {1989},
 journal = {Journal of Pure and Applied Algebra},
 volume = {59},
 number = {1},
 pages = {1--41},
 url = {https://www.sciencedirect.com/science/article/pii/0022404989901606}
}