@article{bwmeta1.element.desklight-a2c1a2ad-98a9-46ac-82ec-962c65f0f48f,
author = {J. Dudek},
title = {Number of algebraic operations in idempotent groupoids},
journal = {Colloquium Mathematicae},
volume = {22},
year = {1970},
pages = {169-177},
zbl = {0216.08904},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-a2c1a2ad-98a9-46ac-82ec-962c65f0f48f}
}
J. Dudek. Number of algebraic operations in idempotent groupoids. Colloquium Mathematicae, Tome 22 (1970) pp. 169-177. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-a2c1a2ad-98a9-46ac-82ec-962c65f0f48f/