Energy level crossing of 'NI POT.++' Ion induced by magnetic field in 'NI'sn'CL IND.6'.6'H IND.2'o and 'ALFA'. 'NI's'O IND.4'.6'H IND.2'o - Becerra, Carlos Castilla; Paduan-Filho, Armando; Oliveira Junior, Nei Fernandes de (Physica Status Solidi B, 1985)