1. Hedman, S. G."Vortex Latticc Method for Calculatioil of Quasi Steady State Loadings onThin ElasticWings," Report 105,Oct. 1965, Aeronautical Research Institute of Sweden.
2. Belotserkovskii, S.M.,Tlie TII.J~J of Tliirr Wirrgsirr Subsotiic Flow. Plenum Press,NewYork, 1967.