@article{BASM_2019_2_a5,
     author = {Mihail Popa and Victor Pricop},
     title = {On the upper bound of the number of functionally independent focal quantities of the {Lyapunov} differential system},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {99--112},
     publisher = {mathdoc},
     number = {2},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2019_2_a5/}
}