Campbell, S.L <br/><br/>
Singular systems of differential equations II 
S.L. Campbell 
 - Boston  Pitman Advanced Publishing Program  1982 
 - 234 
 - Research notes in mathematics 61 .
<br/><br/><label>ISBN: </label>0273085166 
<br/><br/><label>Dewey Class. No.: </label>10.01  / CAMP