1. Zur Problematik der Hüllenbestimmung von Intervallgleichungssystemen, Interval Mathematics;Beeck,1975
2. Iterative Solution of Nonlinear Equations in Several Variables;Ortega,1970
3. Computational Solution of Nonlinear Operator Equations;Rall,1969
4. Theory of Elastic Stability;Timoshenko,1936