Schmidt, M. The chemistry of Sulphur, Selenium, Tellurium and Polonium / M. Schmidt, W. Siebert and K. W. Bagnall - Oxford : Pergamon Press, 1973 - 213 p. ; 23 cm. ISBN: 0080188567 Subjects--Topical Terms: Chemistry, InorganicSulphurSeleniumTelluriumPolonium