00561nam a2200181 a 450000500170000002000150001708200210003210000170005324500270007026000520009730000220014949000500017169000340022196400250025599700180028099900150029895200660031320251203090445.0  a0821845187  a515.35,bDD, Yan  aYan-Qian, Ye  aTheory of limit cycles  aProvidencebAmerican Mathematical Societyc1986  axi, 435p., 22 cm.  aTranslations of mathematical monographsdv.66  aDifferential equations,curves  bEngc100de010fg_  a17834 LIBSC C  c8229d8229  00104070aPUbPUd1998-04-08l0o515.35, DD, Yanp17834yBK