ANISOTROPIC PROPERTIES OF MULTILAYER OPTICAL-WAVEGUIDES ArticleSOTIN V.E., SHEVTSOV V.M.PISMA V ZHURNAL TEKHNICHESKOI FIZIKI / Technical Physics Letters. Vol. 10. 1984. P.. 475-479
SOME PROPERTIES OF GENERALIZED MANIFOLDS ArticleZERKALOV L.G.Russian Mathematical Surveys. Vol. 39. 1984. P.. 215-216