@article{BASM_2005_2_a2,
     author = {Natalia Gherstega and Mihail Popa},
     title = {Lie algebras of the operators and three-dimensional polynomial differential systems},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {51--64},
     publisher = {mathdoc},
     number = {2},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2005_2_a2/}
}