00655nam a22002057a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001500102100002200117245007000139260004100209300001100250490007900261650003000340830007900370CHAP20220329140457.0971013s1967            r     00010     d  a52544  a53516  a57666  cCHAP  a517.38bF400aFeshchenko, S. F.  aAsymptotic methods in the theory of linear differential equations  aNew York :bAmerican Elsevier,c1967  a270 p.  aModern analytic and computational methods in science and mathematicsv; 1014aEcuaciones diferenciales.0 aModern analytic and computational methods in science and mathematicsv; 10