Eckhaus, Wiktor. <br/><br/>
Matched asympotic expansions and singular perturbations   
by Wiktor Eckhaus 
 - Amsterdam  North-Holland  1973 
 - 145p. 
 - North-Holland Mathematics Studies 6 .
<br/><br/><label>ISBN: </label>0 7204 2600 6 
<br/><br/><label>LCCN: </label>72-96145 
<br/><br/><label>Dewey Class. No.: </label>515.234  / N73