@article{105158, author = {V\'aclav Havel}, title = {Nets and groupoids. II.}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {009}, year = {1968}, pages = {87-93}, zbl = {0162.24002}, mrnumber = {0231275}, language = {en}, url = {http://dml.mathdoc.fr/item/105158} }
Havel, Václav. Nets and groupoids. II.. Commentationes Mathematicae Universitatis Carolinae, Tome 009 (1968) pp. 87-93. http://gdmltest.u-ga.fr/item/105158/
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