Arkowitz, M. <br/><br/>
Groups of homotopy classes  (rank formulas and homotopy-commutativity) 
M. Arkowitz and C.R. Curjel 
 - 2nd rev. ed 
 - Berlin  Springer-Verlag  1967 
 - 35p. 28cm 
 - Lecture notes in mathematics  4 .
<br/><br/>Bibliography: p.34-35 
<br/><br/><label>LCCN: </label>67-17948 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Homotopy theory<br/>Groups, theory of