1. Bar N, Barton N (2016) Empirical slope design for hard and soft rocks using Q-slope. In: Proceedings of the 50th US rock mechanics/geomechanics symposium, ARMA 2016, Houston, 26–29 June 2016. ARMA16-384
2. Bar N, Barton N, Ryan CA (2016) Application of the Q-slope method to highly weathered and saprolitic rocks in Far North Queensland. In: Ulusay R et al (eds) Rock mechanics and rock engineering: from the past to the future; Proceedings of the ISRM international symposium, Eurock 2016, Cappadocia, 29–31 August 2016, pp 585–590
3. Barton N (1973) Review of a new shear-strength criterion for rock joints. Eng Geol 7(4):287–332
4. Barton N, Bar N (2015) Introducing the Q-slope method and its intended use within civil and mining engineering projects. In: Schubert W, Kluckner A (eds) Future development of rock mechanics; Proceedings of the ISRM regional symposium, Eurock 2015 and 64th geomechanics colloquium, Salzburg, 7–10 October 2015, pp 157–162
5. Barton N, Grimstad E (2014) Forty years with the Q-system in Norway and abroad, vol 4.1–4.25. Fjellsprengningsteknikk, Bergmekanikk, Geoteknikk, NFF, Oslo