1. Stability, instability and design of pillar workings;Salamon;Int. J. Rock Mech. Min. Sci.,1970
2. Strength of Materials;Timoshenko,1956
3. Collapse of areas worked by the small pillar method;Tincelin,1960
4. Rib control of bedded roof stresses;Adler,1961
5. Vergleichende Betrachtungen uber die methematisch und aus Messungen unter Tage ermittelten Pfeiler belastungen im Kalibergbau;Höfer;Bergakademie,1963