1. Barnett, S., & Cameron, R. G. (1985). Introduction to mathematical control theory (2nd ed., pp.84-89). Oxford: Clarendon
2. Carslaw, H. S., & Jaeger, J. C. (1959). Conduction of heat in solids (pp. 64-70). London: Oxford University Press.
3. Cvitanović, P., & Gibson, J. F. (2010). Geometry of turbulence in wall-bounded shear flows: Periodic orbits. Physica Scripta T, 142, 014007. https://doi.org/10.1088/0031-8949/2010/T142/014007
4. Davidson, P. A. (2015). Turbulence (2nd ed.). New York: Oxford University Press.
5. Desroches, M., Guckenheimer, J., Krauskopf, B., Kuehn, C., Osinga, H. M., & Wechselberger, M. (2012). Mixed-mode oscillations with multiple time scales. SIAM Review, 54, 211–288. https://doi.org/10.1137/100791233