1. Boutin P, Tremblay R (1964) Extraction of bitumen and oil from Athabaska tar sands. Canadian Patents CA680576, 1964-02-18
2. Tremblay R, Boutin P (1967) Method and apparatus for the separation and recovery of ores. Canadian Patent No. 694547, 1964-09-15
3. Wheeler DA (1985) Column Flotation – the original column. In Proceedings of 2nd Latin American Congress in Froth Flotation (S.H.Castro, J.Alvarez Eds.) 19-23 August, Chile. Also in Developments in Mineral Processing, Vol.9, Elsevier 1988, 17–40
4. Cienski T, Coffin V (1981) Column flotation operation at Mines Gaspé molybdenum circuit. Proceedings of the 13th Annual Meeting of the Canadian Mineral Processors, CIM, Ottawa (Canada), 240–262
5. Finch JA, Dobby G (1990) Column flotation. Pergamon Press, Oxford