Dietlinde Kober (2013). COST REDUCTION FOR SYMMETRIC STRUCTURES COMPARED TO PLAN IRREGULAR ONES. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 13th SGEM GeoConference NANO, BIO AND GREEN   TECHNOLOGIES FOR A SUSTAINABLE FUTURE. https://doi.org/10.5593/sgem2013/bf6/s27.011