1. Chernov, A. V. On the Convexity of Reachability Sets of Controlled Initial-Boundary Value Problem, Differential Equations 50, No. 5, 700–710 (2014).
2. Polyak, B. Convexity of the Reachable Set of Nonlinear Systems Under L 2 Bounded Controls, Dynamics of continuous, discrete and impulsive systems. Ser. A: Math. Anal. 11, No. 2–3, 255–268 (2004).
3. Reißig G. Convexity of Reachable Sets of Nonlinear Ordinary Differential Equations, Automation and Remote Control 68, No. 9, 1527–1543 (2007).
4. Cannarsa, P., Sinestrari, C. Convexity Properties of the Minimum Time Function, Calc. Var. Partial Diff. Equat. 3, No. 3, 273–298 (1995).
5. Chernov, A. V. A Majorant Criterion for the Total Preservation of Global Solvability of Controlled Functional Operator Equation, RussianMathematics (Iz. VUZ) 55, No. 3, 85–95 (2011).