TURUTA S. LOTKA-VOLTERRA CUBICDIFFERENTIAL SYSTEMS WITH (1:-2)- SINGULARITY AND INVARIANT AFFINE STRAIGHT LINES OF TWO DIRECTIONS OF TOTAL ALGEBRAIC MULTIPLICITY SIX. ActaEX [Internet]. 2019Jul.8 [cited 2024Oct.16];2(2):71-7. Available from: https://revistaust.upsc.md/index.php/acta_exacte/article/view/319