1. Nature and distribution of vanadium and nickel complexes in petroleum;Branthaver,1976
2. Practices in handling products of combustion from Venezuelan residual fuel oil;Fitzmaurice,1976
3. How Canadian Petrofina recovers vanadium from petroleum;Whigam;Chem. Eng., March,1965
4. Extraction of vanadium from athabasca tar sands fly ash
5. Recovery of vanadium and nickel from Athabasca tar sands fly ash;Stemerowicz;CIM Bull.,1976