TY - JOUR AU - Albrecht, Ernst TI - A characterization of spectral operators on Hilbert spaces JO - Glasgow mathematical journal PY - 1982 SP - 91 EP - 95 VL - 23 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500004821/ DO - 10.1017/S0017089500004821 ID - 10_1017_S0017089500004821 ER -