@article{RSMUP_1967__37__112_0,
author = {Friberg, J.},
title = {Principal parts and canonical factorisation of hypoelliptic polynomials in two variables},
journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
volume = {39},
year = {1967},
pages = {112-132},
mrnumber = {212339},
zbl = {0168.07802},
language = {en},
url = {http://dml.mathdoc.fr/item/RSMUP_1967__37__112_0}
}
Friberg, J. Principal parts and canonical factorisation of hypoelliptic polynomials in two variables. Rendiconti del Seminario Matematico della Università di Padova, Tome 39 (1967) pp. 112-132. http://gdmltest.u-ga.fr/item/RSMUP_1967__37__112_0/
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