@article{10_4064_cm_20_2_159_179,
     author = {Jaroslav Je\v{z}ek},
     title = {Primitive classes of algebras with unary and nullary operations},
     journal = {Colloquium Mathematicum},
     pages = {159--179},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1969},
     doi = {10.4064/cm-20-2-159-179},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-20-2-159-179/}
}