Characterization of cobalt(II) compound with 4-nitroso-2,5-dimethylresorcinol and cetylpyridinium bromide by visible and infrared spectraJohannes, Ille; Sidoruk, Jelena; Lahe, LiljaEesti Teaduste Akadeemia Toimetised. Keemia1994 / lk. 195-199: ill