@book {MR0019765,
    AUTHOR = {Titchmarsh, E. C.},
     TITLE = {Eigenfunction {E}xpansions {A}ssociated with {S}econd-{O}rder
              {D}ifferential {E}quations},
 PUBLISHER = {Oxford, at the Clarendon Press},
      YEAR = {1946},
     PAGES = {175},
   MRCLASS = {42.4X},
  MRNUMBER = {0019765 (8,458d)},
MRREVIEWER = {H. Pollard},
  BOEKCODE = {34B25},
}

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