@article{1077491086,
author = {Cassity, C. Ronald},
title = {The maps determined by the principal curves associated with five and
six points in the plane},
journal = {Duke Math. J.},
volume = {5},
number = {1},
year = {1939},
pages = { 146-163},
language = {en},
url = {http://dml.mathdoc.fr/item/1077491086}
}
Cassity, C. Ronald. The maps determined by the principal curves associated with five and
six points in the plane. Duke Math. J., Tome 5 (1939) no. 1, pp. 146-163. http://gdmltest.u-ga.fr/item/1077491086/