1.
Groups of Homotopy Classes : (Rank formulas and Homotopy-commutativity)
by Arkowitz, M., Curjel, C. R.
ISBN: 9783540039006
List Price: $26.00
2.
Groups of Homotopy Classes : Rank Formulas and Homotopy - Commutativity
by Arkowitz, M., Curjel, C. R.
ISBN: 9780387039008
List Price: $15.90