Jozef Gnap, Jana Kupčuljaková, Ľubomír Černický, and Grzegorz Dydkowski. “The Transport Service of Small Towns”. Communications - Scientific Letters of the University of Zilina, Vol. 23, no. 1, Jan. 2021, pp. A21-A31, doi:10.26552/com.C.2021.1.A21-A31.