JANKIEWICZ, Urszula and FRĄK, Magdalena. Identification and properties of a keratinase from Stenotrophomonas maltophilia N4 with potential application in biotechnology. Ecological Questions. Online. 19 February 2018. Vol. 28, pp. 15-24. [Accessed 19 June 2026]. DOI 10.12775/EQ.2017.034.