1. A practical method for calculating largest Lyapunov exponents from small data sets;Rosenstein;Physica,1993
2. On the stability of multiple helical vortices
3. Glauert H. 1927. A general theory of the autogyro. Aeronautical Research Council, R&M N.1132.
4. On the part played in propulsion by differences in fluid pressure;Froude;Trans. Inst. Naval Architects,1989