THE REAL PROSYMMETRIC SPACES Статья Matveyev O.A., Nesterenko E.L., Goldberg Vladislav Non-associative algebra and its applications. Chapman & Hall/CRC, Boca Raton, FL. 2006. С. 253-260
ON THE QUASIGROUP PROPERTIES OF PROSYMMETRIC SPACES WITH ZERO CURVATURE Статья Matveyev Oleg, Nesterenko Elena, Goldberg Vladislav Webs & quasigroups. Tver State Univ., Tverʹ. 2002. С. 78-84