@inbook{401548,
title = {9. General (multiple-valued) mappings},
booktitle = {Foundations of the Theory of Groupoids and Groups},
series = {GDML\_Books},
publisher = {VEB Deutscher Verlag der Wissenschaften},
address = {Berlin},
year = {1974},
pages = {70-74},
url = {http://dml.mathdoc.fr/item/401548}
}
(éd.). 9. General (multiple-valued) mappings, dans Foundations of the Theory of Groupoids and Groups, GDML_Books, (1974), pp. 70-74. http://gdmltest.u-ga.fr/item/401548/