MASTINŠEK, Miklavž, 2004, Henríquez, Hernán R.: The Kneser property for abstract retarded functional differential equations with infinite delay. - Int. J. Math. Math. Sci. 2003, no. 26, 1645-1661 (2003). [ISSN 0161-1712]. Zentralblatt MATH database [na spletu]. 2004. [Dostopano 23 januar 2025]. Pridobljeno s: http://www.zentralblatt-math.org/zmath/en/advanced/?q=an:1029.34065