1. Sol H: influence of Poisson ratio on bending modeshapes and resonance frequencies. Internal Report 86/01, Free University of Brussels ( VUB ), January 1986.
2. De Wilde WP & Sol H: Identification of anisotropic plate rigidities using experimental free vibration data. Internal Report 85/03, Free University of Brussels (VUB), December 1985.
3. Sol H: Calculation of the eigenfrequencies and modeshapes of anisotropic rectangular plates with 4 free edges. Internal Report 85/01, Free University of Brussels (VUB), March 1985.