1. Aleksandar Kostić, Vladimir Rakočević, Stojan Radenović: Best proximity points involving simulation functions with w0-distance, Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas, 113:2 (2019), 715–727.

2. Aleksandar Kostić, Erdal Karapınar, Vladimir Rakočević: Best proximity points and fixed points with R-functions in the framework of w-distances, Bulletin of the Australian Mathematical Society, 99:3 (2019), 497–597.

3. Aleksandar Kostić: Best proximity points revisited, Filomat 33:16 (2019), 5159–5166.

4. Aleksandar Kostić: Best proximty points for a new type of set-valued mappings, Mathematica Slovaca 69(6) (2019), 1395–1402.