Gerard, R. and Ramis, J. P. , ed. <br/><br/>
Equations differentielles et systemes de pfaff dans le champ complexes   

 - Berlin  Springer-Verlag  1978 
 - 364p. 
 - Lecture notes in Mathematics   712 .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>516  / G357.ED