1. Bjarnasson , B. H. Klasson R. Leijon L. Strundell T. Ohman Rock stress measurements in boreholes KAS02, KAS03, and KAS05 on Äspö, Swedish Nuclear Fuel and Waste Management Company Stockholm 1989
2. Experimente zur inneren tektonik;Cloos;Zentralbl. Min. Geol. Palaeontol.,1928
3. JOINTS AND SHEAR FRACTURES IN ROCK
4. Ericsson , L. O. Fracture mapping study on Äspö island, Findings of directional data, Swedish Nuclear Fuel and Waste Management Company Stockholm 1988