@article{01780323,
title = {Pythagorean identity for polyharmonic polynomials.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {30},
year = {2002},
pages = {115-119},
doi = {10.1155/S0161171202003393},
zbl = {1001.31006},
language = {en},
url = {http://dml.mathdoc.fr/item/01780323}
}
Fryant, Allan; Vemuri, Murali Krishna. Pythagorean identity for polyharmonic polynomials.. International Journal of Mathematics and Mathematical Sciences, Tome 30 (2002) pp. 115-119. doi : 10.1155/S0161171202003393. http://gdmltest.u-ga.fr/item/01780323/