Heikkila, Seppo  <br/><br/>
Monotone interactive techniques for discontinuous nonlinear differential equations 
/ by Seppo Heikkila & V. Lakshmikantham 
 - new york  Marcel Dekker  1994 
 - 514p. 
<br/><br/><label>Dewey Class. No.: </label>515.355  / HEI/M