For citation Example: Azizov T. Ya // Ukr. Mat. Zh. - 1989. - 41, № 7. - pp. 958–961 The variant of inevriable dual pair.
Citation Example: Azizov T. Ya. An extension of invariant dual pairs // Ukr. Mat. Zh. - 1989. - 41, № 7. - pp. 958–961.