@article{GDZPPN002354233, title = {Universal parallel composition laws and their representations.}, journal = {Mathematica Scandinavica}, volume = {40}, year = {1977}, pages = {25-45}, zbl = {0366.94058}, url = {http://dml.mathdoc.fr/item/GDZPPN002354233} }
Ng, C.T. Universal parallel composition laws and their representations.. Mathematica Scandinavica, Tome 40 (1977) pp. 25-45. http://gdmltest.u-ga.fr/item/GDZPPN002354233/