White, Arthur T.
Graphs of groups on surfaces interactions and models - Amsterdam Elsevier 2001 - 363 - North-Holland Mathematics Studies; 188 .
0444500758
519.17 WHI
Graphs of groups on surfaces interactions and models - Amsterdam Elsevier 2001 - 363 - North-Holland Mathematics Studies; 188 .
0444500758
519.17 WHI