1. Elementare Tensorrechnung für Ingenieure;Betten,1977
2. Creep theory of anisotropic solids;Betten;Journal of Rheology,1981
3. Zur Aufstellung von Stoffgleichungen in der Kriechmechanik anisotroper Körper;Betten;Rheol. Acta,1981
4. Representation of constitutive equations in creep mechanics of isotropic and anisotropic materials;Betten,1981
5. Integrity basis for a second-order and a fourth-order tensor;Betten;Internet. J. Math. & Math. Sci.,1982