@article{GDZPPN002210436,
title = {Nonsmoothable Zp actions on contractible 4-manifolds.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {435},
year = {1993},
pages = {29-54},
zbl = {0764.57024},
url = {http://dml.mathdoc.fr/item/GDZPPN002210436}
}
Lawson, Terry; Kwasik, Slawomir. Nonsmoothable Zp actions on contractible 4-manifolds.. Journal für die reine und angewandte Mathematik, Tome 435 (1993) pp. 29-54. http://gdmltest.u-ga.fr/item/GDZPPN002210436/