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), pp. 71-87. doi: 10.36120/2587-3644.v2i2.71-87.