Campbell, S. L. V. <br/><br/>
Singular systems of differential equations 
S. L. Campbell. 
 - San Francisco  Pitman Advanced Pub. Program  1980. 
 - 176 pages ;    24 cm. 
 - Research notes in mathematics  40 .
<br/><br/>p. 167-171. 
<br/><br/><label>ISBN: </label>0822484382 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations<br/>Equations, Simultaneous