00343nam a2200121 a 450000500170000002000150001708200210003210000170005324500270007026000520009730000220014949000500017120251203090445.0  a0821845187  a515.35,bDD, Yan  aYan-Qian, Ye  aTheory of limit cycles  aProvidencebAmerican Mathematical Societyc1986  axi, 435p., 22 cm.  aTranslations of mathematical monographsdv.66