@article{GDZPPN001169238,
title = {On the Number of Nodes in Self-Contained Integration Formulas of Degree Two for Compact Planar Regions.},
journal = {Numerische Mathematik},
volume = {15},
year = {1970},
pages = {224-230},
zbl = {0194.18702},
url = {http://dml.mathdoc.fr/item/GDZPPN001169238}
}
FRITSCH, F.N. On the Number of Nodes in Self-Contained Integration Formulas of Degree Two for Compact Planar Regions.. Numerische Mathematik, Tome 15 (1970) pp. 224-230. http://gdmltest.u-ga.fr/item/GDZPPN001169238/