HÖLBL, Marko, WELZER-DRUŽOVEC, Tatjana in BRUMEN, Boštjan, 2008, Improvement of the Peyravian-Jeffries`s user authentication protocol and password change protocol. Computer communications [na spletu]. 2008. [Dostopano 18 april 2025]. Pridobljeno s: http://dx.doi.org/10.1016/j.comcom.2007.12.029