Geometric differential equations - Recent past and proximate future.
Geometric differential equations as founded by Poincare and Liapunov, noting structural stability
Lefschetz, S.↗
Engineering topics
Lefschetz, S.
Publications and source records attributed to Lefschetz, S..
Stability of nonlinear control systems.
Text on stability of control system as developed from direct method of Liapunov, noting V. M. Popov contribution
SYSTEM STABILITY↗