Arkowitz, M <br/><br/>
Groups of Homotopy Classes  Rank formulas and homotopy - commutativity 
M. Arkowitz, C. R. Curjel 
 - Berlin  Springer - Verlag  1967 
 - 35 p  ill  28 cm 
 - Lecture Notes in Mathematics  4 .
<br/><br/> Contine bibliografie  A collection of informal reports and seminars