Godbillon C.
Dynamical systems of surfaces - Герман Springer-Verlag 1983 - 201
3540116451 3000 0387116451 3000
mathematics dynamical systems vector fields
Dynamical systems of surfaces - Герман Springer-Verlag 1983 - 201
3540116451 3000 0387116451 3000
mathematics dynamical systems vector fields