1. Andrieu, V., Praly, L., Astolfi, A.: Homogeneous approximation, recursive observer design and output feedback. SIAM J. Control Optim. 47(4), 1814–1850 (2008)
2. Angulo, M., Moreno, J., Fridman, L.: Robust exact uniformly convergent arbitrary order differentiator. Automatica 49(8), 2489–2495 (2013). https://www.scopus.com/inward/record.uri?eid=2-s2.0-84882456671 &doi=10.1016%2fj.automatica.2013.04.034 &partnerID=40 &md5=80ffefa4d941ca719509c0af8cbc2c75
3. Bacciotti, A., Rosier, L.: Liapunov Functions and Stability in Control Theory, 2nd edn. Springer, New York (2005)
4. Barbot, J.-P., Levant, A., Livne, M., Lunz, D.: Discrete differentiators based on sliding modes. Automatica 112, 108633 (2020). https://doi.org/10.1016/j.automatica.2019.108633
5. Bartolini, G., Pisano, A., Usai, E.: First and second derivative estimation by sliding mode technique. J. Signal Process. 4(2), 167–176 (2000)