Über die Trichotomie von Lösungen einer nichtlinearen Vektordifferentialgleichung zweiter Ordnung Ján Andres, Jarosław Mikołajski, Jindřich Palát (1988) Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
Un teorema di esistenza e di unicità per un'equazione differenziale non lineare Ada Bottaro Aruffo (1980) Rendiconti del Seminario Matematico della Università di Padova
Uniqueness criterion for solution of abstract nonlocal Cauchy problem. Byszewski, L. (1993) Journal of Applied Mathematics and Stochastic Analysis
Uniqueness for a class of cooperative systems of ordinary differential equations Janusz Mierczyński (1994) Colloquium Mathematicae
Uniqueness of a symmetric positive solution to an ODE system. Lopes, Orlando (2009) Electronic Journal of Differential Equations (EJDE) [electronic only]
Univerzální diferenciální rovnice (Věnováno památce Waltera Strodta) Lee A. Rubel (1983) Pokroky matematiky, fyziky a astronomie