KLJUN, Matjaž in ČOPIČ PUCIHAR, Klen, 2015, „I was here“ : enabling tourists to leave digital graffiti or marks on historic landmarks. V : [na spletu]. Objavljeni znanstveni prispevek na konferenci. 2015. p. 490–494. [Dostopano 10 april 2025]. Pridobljeno s: http://link.springer.com/book/10.1007/978-3-319-22723-8
