McMillen, Donald F.; Nigenda, S. Esther; Gonzalez, Alicia C.; Golden, David M.
Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, 1987 , vol. 43, # 2 p. 237 - 240
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , vol. 40, # 6.2 p. 1291 - 1293
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 6 p. 1452 - 1454