Stillwell, J.
Classical Topology and Combinatorial Group Theory. 2nd. edition. - Newyork Springer 1993 - xii, 334p. - Graduate Texts in Mathematics No. 72 .
978-0-387-97970-0
Classical Topology and Combinatorial Group Theory. 2nd. edition. - Newyork Springer 1993 - xii, 334p. - Graduate Texts in Mathematics No. 72 .
978-0-387-97970-0