TY - JOUR AU - Pokrzywa, Andrzej TI - Spectral approximation of positive operators by iteration subspace method JO - Applications of Mathematics PY - 1984 SP - 104 EP - 113 VL - 29 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1984.104074/ DO - 10.21136/AM.1984.104074 LA - en ID - 10_21136_AM_1984_104074 ER -