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, ARMA, pp 16–384
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
3. Proceedings of the ISRM international symposium, Eurock 2016, Cappadocia, 29-31 August 2016, pp 585-590
4. Bar N, Barton N (2017) The Q-slope method for rock slope engineering. Rock Mech Rock Eng 50:3307–3322. https://doi.org/10.1007/s00603-017-1305-0
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