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V. F. Kozlovskii, A. I. Lebedev, Yu. E. Petrov. X-ray and electrical studies of the phase transition in Pb1-xGexSe. - Fizika Tverdogo Tela, volume 28, number 12, pages 3610-3615 (1986). Electrical measurements on single-crystal samples of n-type Pb1-xGexSe with x=0.02-0.08 showed anomalous scattering of carriers indicating a second-order phase transition in these crystals. The dependence of the transition temperature on the crystal composition was established. X-ray studies revealed a rhombohedral distortion of the cubic lattice below Tc; the temperature dependence of the rhombohedral angle was determined. Thallium impurity was found to decrease the transition temperature abruptly. The causes of the systematic decrease of Tc in lead-germanium chalcogenide solid solutions under the substitution Te->Se->S are discussed.