@article{02074134,
title = {Eigenstructure of the equilateral triangle. II: The Neumann problem.},
journal = {Mathematical Problems in Engineering},
volume = {8},
year = {2002},
pages = {517-539},
doi = {10.1080/1024123021000053664},
zbl = {1122.35312},
language = {en},
url = {http://dml.mathdoc.fr/item/02074134}
}
McCartin, Brian J. Eigenstructure of the equilateral triangle. II: The Neumann problem.. Mathematical Problems in Engineering, Tome 8 (2002) pp. 517-539. doi : 10.1080/1024123021000053664. http://gdmltest.u-ga.fr/item/02074134/