@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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