@inproceedings{L_th_2002,
    doi = {10.1145/581478.581492},
    url = {https://doi.org/10.1145%2F581478.581492},
    year = {2002},
    month = {sep},
    publisher = {{ACM}},
    author = {Christoph Lüth and Neil Ghani},
    title = {Composing monads using coproducts},
    booktitle = {Proceedings of the seventh {ACM} {SIGPLAN} international conference on Functional programming}
}

@inproceedings{L_th_2002, doi = {10.1145/581478.581492}, url = {https://doi.org/10.1145%2F581478.581492}, year = {2002}, month = {sep}, publisher = {{ACM}}, author = {Christoph Lüth and Neil Ghani}, title = {Composing monads using coproducts}, booktitle = {Proceedings of the seventh {ACM} {SIGPLAN} international conference on Functional programming} }