EXAMPLES OF POINT RELATIONS WITH COINCIDENT CHARACTERISTIC CONFIGURATIONS. II ArticlePavlyuchenko Yu.V.Webs and quasigroups (Russian). 1984. P.. 138-143
ON THE CANONICAL REDUCTANTS OF SPACES OF CONSTANT CURVATURE ArticleSabinin L.V., Yantranova S.S.Webs and quasigroups (Russian). 1984. P.. 76-83