@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/