Daniewski, Wlodzimierz M.; Gumulka, Maria; Ptaszynska, Katarzyna, Bulletin of the Polish Academy of Sciences, Chemistry, 1991, vol. 39, # 3, p. 251 - 255
Daniewski, Wlodzimierz M.; Gumulka, Maria; Ptaszynska, Katarzyna, Bulletin of the Polish Academy of Sciences, Chemistry, 1991, vol. 39, # 3, p. 251 - 255