@article{1183492031,
author = {Weaver, J. H.},
title = {Invariants of a poristic system of triangles},
journal = {Bull. Amer. Math. Soc.},
volume = {33},
number = {6},
year = {1927},
pages = { 235-240},
language = {en},
url = {http://dml.mathdoc.fr/item/1183492031}
}
Weaver, J. H. Invariants of a poristic system of triangles. Bull. Amer. Math. Soc., Tome 33 (1927) no. 6, pp. 235-240. http://gdmltest.u-ga.fr/item/1183492031/