1. Recovery of Principal Metal Values from Waste Hydroprocessing Catalysts;Jong,1989
2. Regeneration of spent hydroprocessing catalysts: metals removal;Marafi;Appl. Catalysis,1989
3. Safe Handling and Disposal of Spent Catalysts;Habermehl,1988
4. Refiners, petrochem plants focus on new waste challenges;Corbett;OGJ SPECIAL. Oil and Gas J., Marc.,1990