BORDBAR, Hashem in CRISTEA, Irina Elena, 2021, About the normal projectivity and injectivity of krasner hypermodules. Axioms [na spletu]. 2021. Vol. 10, no. 2, p. 1–15. [Dostopano 3 april 2025]. DOI 10.3390/axioms10020083. Pridobljeno s: https://www.mdpi.com/2075-1680/10/2/83