Periodical solutions of some differential equations with small parameter J. Knežević-Miljanović — 1990 Matematički Vesnik
A note on bounded, periodic and stable solutions of differential equations J. Knežević-Miljanović — 1987 Matematički Vesnik
Increasing solutions of ( r ( x ) y ( n ) ) ( n ) = y f ( x ) . Knežević-Miljanović, J. — 1996 Matematichki Vesnik