TY - BOOK AU - TITCHMARSH, E . C . TI - EIGENFUNCTION EXPANSIONS ASSOCIATED WITH SECOND- ORDER DIFFERENTIAL EQUATIONS / U1 - 515.234 PY - 1958/// CY - OXFORD PB - CLARENDON PRESS KW - EXPANSIONS KW - EQUATIONS , SECOND-ORDER - DIFFERENTIAL N1 - P.1. xi , 403 P ER -