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3. Leitmann, G.,On the Equation of Rocket Motion, Journal of the British Interplanetary Society, Vol. 16, No. 3, 1957.
4. Leitmann, G.,Some Remarks on Hamilton's Principle, Journal of Applied Mechanics, Vol. 30, p. 623, 1963.
5. Leitmann, G.,An Elementary Derivation of the Optimal Control Conditions, 12th International Astronautical Congress, Springer-Verlag, Berlin, Germany, 1963.