@article{01716595, title = {Multivariable dimension polynomials and new invariants of differential field extensions.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {25}, year = {2001}, pages = {201-214}, doi = {10.1155/S0161171201006767}, zbl = {1010.12006}, language = {en}, url = {http://dml.mathdoc.fr/item/01716595} }
Levin, Alexander B. Multivariable dimension polynomials and new invariants of differential field extensions.. International Journal of Mathematics and Mathematical Sciences, Tome 25 (2001) pp. 201-214. doi : 10.1155/S0161171201006767. http://gdmltest.u-ga.fr/item/01716595/