@article{00510042,
title = {The semiring of immersions of manifolds.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {34},
year = {1993},
pages = {209-215},
zbl = {0788.53047},
language = {en},
url = {http://dml.mathdoc.fr/item/00510042}
}
Decruyenaere, F.; Dillen, F.; Verstraelen, L.; Vrancken, L. The semiring of immersions of manifolds.. Beiträge zur Algebra und Geometrie, Tome 34 (1993) pp. 209-215. http://gdmltest.u-ga.fr/item/00510042/