@article{1183492921,
author = {Hassler, J. O.},
title = {Plane nets Whose first and minus first Laplacian transforms each degenerate into a straight line},
journal = {Bull. Amer. Math. Soc.},
volume = {34},
number = {6},
year = {1928},
pages = { 591-599},
language = {en},
url = {http://dml.mathdoc.fr/item/1183492921}
}
Hassler, J. O. Plane nets Whose first and minus first Laplacian transforms each degenerate into a straight line. Bull. Amer. Math. Soc., Tome 34 (1928) no. 6, pp. 591-599. http://gdmltest.u-ga.fr/item/1183492921/