1. Lord Kelvin,Mathematical and Physical Papers(Cambridge U.P., London, 1910), Vol. IV, p. 270.
2. J. D. Cole,Singular Perturbations and Asymptotics, edited by R. E. Meyer and S. V. Parter (Academic, New York, 1980), Vol. 35.
3. Free-surface flow over a semicircular obstruction
4. Near critical free surface flow past an obstacle