Stiklakytė, L. “Ober Die Nichtholonome Hyperflache in Verallgemeinerten Euklidischem Raum”. Lithuanian Mathematical Journal 11, no. 3 (June 15, 1971): 669–682. Accessed June 8, 2025. https://www.zurnalai.vu.lt/LMJ/article/view/21023.