CHRYSOBERYL PEGMATITES OF SOUTH-KERALA AND THEIR METALLOGENIC IMPLICATIONS СтатьяSOMAN K., NAIR N.GK., DRUZHININ A.V.JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA. Том 27. 1986. С. 411-418
AGE DATA ON PEGMATITES OF SOUTH KERALA AND THEIR TECTONIC SIGNIFICANCE СтатьяSOMAN K., NAIR N.GK., GOLUBYEV V.N., ARAKELYAN M.M.JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA. Том 23. 1982. С. 458-462