1. É. V. Shpolskii, Usp. Fiz. Nauk.,68, 51 (1959);71, 215 (1960).
2. É. V. Shpolskii and R. I. Personov, Zavod. Lab.,28, No. 4, 428 (1962).
3. A. A. Il'ina and R. I. Personov, Geokhimiya, No. 11, 963 (1962).
4. T. A. Teplitskaya, Luminescence Quasiline Spectra as a Means for the Study of Naturally Occurring Complex Organic Mixtures [in Russian], Izd. Mosk Gos. Univ., Moscow (1971).
5. L. F. Utkina, in: Problems of Radio physics and Spectroscopy [in Russian], Vol. 4, Izd. Mosk. Gos. Ped. Inst. im. V. I. Lenina, Moscow, (1970), p. 62.