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