Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1969_6_6_a2, author = {Yu. I. Yanov}, title = {On directed transformations of formulas}, journal = {Matemati\v{c}eskie zametki}, pages = {663--668}, publisher = {mathdoc}, volume = {6}, number = {6}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a2/} }
Yu. I. Yanov. On directed transformations of formulas. Matematičeskie zametki, Tome 6 (1969) no. 6, pp. 663-668. http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a2/