00421nam a2200121Ia 4500082002000000100005000020245009700070260003400167300001600201490003900217500000500256700003800261  a515.35bC669.RB  aCoddington, E. A. and Snoo, Hendrik S. V. de.  aRegular boundary value problems associated with Paris of ordinary differential expressionsb  aBerlinbSpringer-Verlagc1981  a225p. Index  aLecture notes in Mathematicsv 858  a  aSnoo, Hendrik S. V. de ;jt. auth.