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3. Giesing, J. P.: Extension of the Douglas Neumann Program to Problems of Lifting Infinite Cascades. Mc Donnell Douglas Report No. LB 31653, July 1964.
4. Argyris, J. H., Scharpf, D. W.: Two- and Three-Dimensional Potential Flow by the Method of Singularities Technical Note as Appendix 1 to the Twelfth Lanchester Memorial Lecture. ?The Impact of the Digital Computer on Engineering Sciences?, given before the Royal Aeronautical Society on 14th May 1969.
5. Argyris, J. H., Mareczek, G., Scharpf, D. W.: Two- and Three-Dimensional Flow Using Finite Elements. Technical Note as Appendix II to the Twelfth Lanchester Memorial Lecture.