@article{MZM_1987_41_6_a1,
     author = {S. N. Tronin},
     title = {Commutative associative projective algebras of rank two over a perfect field},
     journal = {Matemati\v{c}eskie zametki},
     pages = {776--780},
     publisher = {mathdoc},
     volume = {41},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_6_a1/}
}