On periodic solutions of the equation x ' ( t ) = F ( t , x ( t ) , x ' ( t ) ) T. Jankowski — 1977 Commentationes Mathematicae The article contains no abstract
On solutions of a functional equation of order r in a special class of functions T. Jankowski — 1983 Matematički Vesnik
On the convergence of approximate solutions of a dynamic programming equation T. Jankowski; M. Kwapisz — 1970 Colloquium Mathematicae
On the existence and uniqueness of solutions of systems of differential equations with a deviated argument T. Jankowski; M. Kwapisz — 1972 Annales Polonici Mathematici
Second-order differential equations with deviating arguments. Jankowski, T.; Szatanik, W. — 2006 Boundary Value Problems [electronic only]