Kevorkian, J. and Cole, J. D. <br/><br/>
Perturbation methods in applied mathematics   

 - New Jersey  Springer-Verlag  1981 
 - x, 558p. Index, Bibl. 
 - Applied Mathematical Sciences    v. 34 .
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<br/><br/><label>Dewey Class. No.: </label>530.1  / K43.PM