Ungureanu Viorica Mariela and Dragan Vasile: Nonlinear differential equations of Riccati type on ordered Banach spaces. (2012)
Dragan Vasile and Morozan Toader: Exponential stability for a class of singularly perturbed Ito differential equations. (2000)
Dragan Vasile and Ionita Achim: Exponential stability for singularly perturbed systems with state delays. (2000)