@article{MOMA_1983__95_178125,
     author = {Kung-Wei Yang},
     title = {Categorical {Convolutional} {Formulas.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {251--256},
     publisher = {mathdoc},
     volume = {95},
     year = {1983},
     zbl = {0513.05006},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1983__95_178125/}
}