@article{DAN_1963_150_2_a1,
     author = {I. I. Valuts\`e},
     title = {Left ideals of the semigroup of endomorphisms of a free universal algebra},
     journal = {Doklady Akademii Nauk},
     pages = {235--237},
     publisher = {mathdoc},
     volume = {150},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_2_a1/}
}