Ervan, Joachim and Falkowski, Bernd-Jurgen <br/><br/>
Low order cohomology and applications   

 - Berlin  Springer-Verlag  1981 
 - vi, 126p. 
 - Lecture notes in Mathematics   877 .
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<br/><br/><label>Dewey Class. No.: </label>514  / Er72.LO