TY - JOUR TI - The shell of a Hilbert-space operator T3 - Acta scientiarum mathematicarum AU - Davis Chandler PY - 1968 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/14177/1/math_029_fasc_001_002_069-086.pdf ER -