THE EFFECT OF THE NONPLANARITY OF HETEROCYCLIC ANALOGUES OF FLUORENE WITH THE PHOSPHORUS ATOM ON SPIN-ORBIT INTERACTIONS Статья Gastilovich E.A., Godik V.A., Korol'kova N.V., Klimenko V.G., Nurmukhametov R.N., Serov S.A. Optics and Spectroscopy (English translation of Optika i Spektroskopiya). Том 97. 2004. С. 187-194