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