EXAMPLES OF POINT RELATIONS WITH COINCIDENT CHARACTERISTIC CONFIGURATIONS. II Статья Pavlyuchenko Yu.V. Webs and quasigroups (Russian). Kalinin. Gos. Univ., Kalinin. 1984. С. 138-143
ON THE CANONICAL REDUCTANTS OF SPACES OF CONSTANT CURVATURE Статья Sabinin L.V., Yantranova S.S. Webs and quasigroups (Russian). Kalinin. Gos. Univ., Kalinin. 1984. С. 76-83