Vercek, Bojan; Ogorevc, Bozidar,; Stanovnik, Branko; Tisler, Miha
Monatshefte fuer Chemie, 1983 , vol. 114, p. 789 - 798

Marchalin, Miroslav; Martvon, Augustin
Collection of Czechoslovak Chemical Communications, 1980 , vol. 45, # 8 p. 2329 - 2333