TY - JOUR TI - Spectrum of class A(s,t) operators T3 - Acta scientiarum mathematicarum AU - Uchiyama Atsushi PY - 2004 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/16031/1/math_070_numb_001_002_279-287.pdf ER -