Gabriel, Peter, <br/><br/>
Calculus of fractions and homotopy theory 
[by] P. Gabriel and M. Zisman. 
 - Berlin,  New York,  Springer-Verlag,  1967. 
 - x, 168 p. 
<br/><br/><label>Subjects--Index Terms: </label>Homotopy theory 
<br/><br/><label>Universal Decimal Class. No.: </label>515.143  / GAB