CONSTRUCTION, IN THE PLANE, OF SYSTEMS OF DIFFERENTIAL-EQUATIONS FROM THE DECOMPOSITION BY TRAJECTORIES OF A REGION WITH CRITICAL-POINTS ON THE BOUNDARY Article VOLKOV S.V. Differential Equations. Vol. 21. 1985. P. 889-891
CONSTRUCTION OF DIFFERENTIAL-EQUATION SYSTEMS IN 3-DIMENSIONAL SPACE FROM PROPERTIES OF THEIR INTEGRAL CURVES Article VOLKOV S.V. Differential Equations. Vol. 18. 1982. P. 409-414