1. Bharathi K, Nagaraj M (1987) Quaternion valued function of a real variable Serret–Frenet formula. Indian J Pure Appl Math 18(6):507–511
2. Karadaǧ M, Sivridaǧ Aİ (1997) Characterizations for ouaternionic trendlines. Univ Erciyes J Inst Sci Technol Erciyes Univ 13:23–36
3. Tuna A, Çöken AC (2014) On the quaternionic inclined curves in the semi-Euclidean space $$E_{2}^{4}$$. Appl Math Comput 155(2):373–389
4. Erişir T, Güngör MA (2014) Some characterizations of quaternionic rectifying curves in the semi-Euclidean space $$E_{2}^{4}$$. Honam Math J 36(1):67–83
5. Demir S, Özdaş K (2005) Serret–Frenet formulas with real quaternions. University of Süleyman Demirel J Inst Sci 9(3):1–7