@article{700611,
     title = {Algebras of continuous functions in universal algebra},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {[331]-332},
     mrnumber = {MR0485641},
     zbl = {0386.54011},
     url = {http://dml.mathdoc.fr/item/700611}
}

Nelson, Evelyn. Algebras of continuous functions in universal algebra, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. [331]-332. http://gdmltest.u-ga.fr/item/700611/