00393nam a2200121Ia 4500082002000000100003800020245005100058260004800109300001700157490006000174500000500234700003200239  a515.72bEr66.LS  aErdelyi, Ivan and Shongwang, Wang  aA local spectral theory for closed operatorsb  aCambridgebCambridge University Pressc1985  a177p. Index.  aLondon Mathematical Society lecture note series no. 105  a  aShongwang, Wang ; jt. auth.