@article{BASM_2019_2_a8,
     author = {Natalia Neagu and Victor Orlov and Mihail Popa},
     title = {Invariant conditions of stability of unperturbed motion governed by critical differential systems $s(1,2,3)$},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {137--153},
     publisher = {mathdoc},
     number = {2},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2019_2_a8/}
}