1. Hot-water separation of Alberta bituminous sand;Clark;Trans Can Inst Min Metall,1944
2. Athabasca oil sands; apparent example of local origin of oil;Ball;Bull Am Assoc Petrol Geol,1935
3. Hot water process development for Utah tar sands;Miller;Fuel Process Technol,1982
4. Miller D, Sepulveda Jaime E. Separation of bitumen from dry tar sands. US patent 4120776, issued on October 17, 1978.
5. Smith L. Ambient froth flotation process for the recovery of bitumen from tar sand, US 4425227, issued on January 10, 1984.