@article{700756,
     title = {On profinite universal algebras},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1972},
     pages = {51-62},
     mrnumber = {MR0351960},
     zbl = {0311.22003},
     url = {http://dml.mathdoc.fr/item/700756}
}

Banaschewski, B. On profinite universal algebras, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1972), pp. 51-62. http://gdmltest.u-ga.fr/item/700756/