[1] Blümel, W. & Iwanoff, A., 1993: Folgerungen und Empfehlungen zur Ausbildung von Böschungen für die geplante Erweiterung der Kreidegrube Heidenstrasse in Lägerdorf (Conclusions and recommendations for the formation of embankments for the planned expansion of the chalk pit Heidenstrasse in Lägerdorf). internal report, Alsen-Breitenburg, Hamburg

[2] Descamps, F.; Faÿ, O.; Bury, D., 2019: Geological and geomechanical study of three drillholes in the Mons Basin Chalk (Obourg site, Belgium). internal report, Université de Mons, Mons

[3] Gonze, N.; Vandycke, S.; Tshibangu, J.-P., 2017: Etude d’un talus de liquidation pour la paroi Est-Ouest de la carrière de craie n°3 à Oboug (Study of a liquidation slope for the east-west wall of the chalk quarry no. 3 in Oboug). internal report, Université de Mons, Mons

[4] International Society for Rock Mechanics, 1981: Rock Characterization, Testing and Monitoring: International Society for Rock Mechanics Suggested Methods, Pergamon Press, London

[5] Iwanoff, A., 1994: Erweiterung Kreidegrube Heidestrasse – Gutachten zu den Kalkgehalten der Schreibkreide (Extensoin of the Heidestrasse chalk pit – expert opinion on the lime content of the chalk). internal report, Alsen-Breitenburg, Hamburg.

[6] Kapphahn, M., 2010: Winter operations – Theses on mining of chalk at low temperatures. AT Mineral Processing, Gütersloh, pp. 52-63

[7] Popescou, D., 2013: Volsk – Geologic Investigation – Site visit report. internal report, Holcim Technology, Holderbank

[8] Scheurer, L., 2007: Volsk Cement Plant - Assessment of Raw Material Situation of the Bolschevik Deposit. internal report, Holcim Technology, Holderbank.

[9] Tshibangu, J.-P.; Vandcke, S.; Gonze, M., 2019: Stabilité de talus dans la carrière de la craie à Obourg (Embankment stability in the chalk quarry at Obourg). internal report, Université de Mons, Mons

[10] Valitov, T., 2019: CP graduation report – Assessment of the Resources and Reserves situation of the Volsk plant. internal report, LafargeHolcim Russia, Moscow