Johnson, R. S. <br/><br/>
Singular perturbation theory :  mathematical and analytical techniques with applications to engineering / 
R. S. Johnson 
 - New York :  Springer,  2004 
 - 292 p.:  ill.;  24 cm. 
<br/><br/><label>ISBN: </label>0387232001 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Perturbation (Mathematics)<br/>Engineering mathematics