1. Leipholz, H.: Stability Theory; pp. 180, 181 New York and London: Academic Press 1970
2. Leipholz, H.: On the Sufficiency of the Energy Criterion for the Stability of Certain Nonconservative Systems of the Follower-Load Type. J. of Appl. Mech. 39 (1972) 717?722
3. Leipholz, H., Polzin, T.: On a Lower Bound Theorem for the Buckling Load of Elastic Beams Subjected to Nonconservative, Compressive Follower Loads. Acta Mech. 25 (1977) 171?186
4. Leipholz, H.: Quantitative Evaluation of Continuous Nonconservative Systems' Behaviour by Energy-like Methods. Proc. 16th Midwest. Mech. Conf., Kansas, 1979, Vol. 10, pp. 267?277
5. Leipholz, H.: Stability of Elastic Systems. Germantown Maryland: Sijthoff and Noordhoff, Alphen aan den Rijn 1980, pp. 45, 265