Tyrrell, J. A. and Semple, J. G. <br/><br/>
Generalized clifford parallelism   

 - Cambridge  Cambridge University Press  1971 
 - 140p. Index. Bibl. 
 - Cambridge tracts in Mathematics and Mathematical Physics   no. 61 .
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<br/><br/><label>Dewey Class. No.: </label>516  / T993.GC