@article{GDZPPN002187663,
title = {On the sharpness of the ... 2 and ... 1 Nielsen numbers.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {258},
year = {1973},
pages = {101-108},
zbl = {0273.55011},
url = {http://dml.mathdoc.fr/item/GDZPPN002187663}
}
Brooks, Robin. On the sharpness of the ... 2 and ... 1 Nielsen numbers.. Journal für die reine und angewandte Mathematik, Tome 258 (1973) pp. 101-108. http://gdmltest.u-ga.fr/item/GDZPPN002187663/