00307nam a2200121Ia 4500008004100000040001800041041001200059082001500071100001000086245006300096260000900159300001700168230917s9999||||xx |||||||||||||| ||und||  e5010420aMAIN  aEnglish  a515.35 U5N  aUrmil 0aNumerical solutions for some singularly perturbed problems  c2022  axvii, 237 p.