TURUTA, S. (2019). LOTKA-VOLTERRA CUBICDIFFERENTIAL SYSTEMS WITH (1:-2)- SINGULARITY AND INVARIANT AFFINE STRAIGHT LINES OF TWO DIRECTIONS OF TOTAL ALGEBRAIC MULTIPLICITY SIX. Acta Et Commentationes Exact and Natural Sciences, 2(2), 71-87. https://doi.org/10.36120/2587-3644.v2i2.71-87