@article{GDZPPN002215306, title = {Morphismen von Funktoren.}, journal = {Manuscripta mathematica}, volume = {1}, year = {1969}, pages = {87-98}, zbl = {0164.01302}, url = {http://dml.mathdoc.fr/item/GDZPPN002215306} }
Pumplün, Dieter; Röhrl, Helmut. Morphismen von Funktoren.. Manuscripta mathematica, Tome 1 (1969) pp. 87-98. http://gdmltest.u-ga.fr/item/GDZPPN002215306/