Kumpera, Antonio. <br/><br/>
Systems of linear partial differential equations and deformation of pseudogroup structures / 
A. Kumpera and D. C. Spencer. 
 - Montreal :  Les Presses de l'Universite de Montreal,  1974. 
 - 100 p. ;  28 cm. 
 - Seminaire de mathematiques superieures ;  41. .
<br/><br/> At head of title: Departement de mathematiques, Universite de Montreal. 
<br/><br/>Bibliography: p. 99-100. 
<br/><br/><label>ISBN: </label>0840502494 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pseudogroup structures, Deformation of.<br/>Differential equations, Partial.