@article{GDZPPN002220059, title = {On Underlying Functors in General and Topological Algebra.}, journal = {Manuscripta mathematica}, volume = {22}, year = {1977}, pages = {209-226}, zbl = {0356.18007}, url = {http://dml.mathdoc.fr/item/GDZPPN002220059} }
Porst, Hans.-E. On Underlying Functors in General and Topological Algebra.. Manuscripta mathematica, Tome 22 (1977) pp. 209-226. http://gdmltest.u-ga.fr/item/GDZPPN002220059/