1. T.D. Cooke,Gold Bull., 1982,15, (2), 38–42
2. Ch. Glynn and R. Conley,Gold Bull., 1979,12, (4), 134–139
3. M. Antler,Gold Bull, 1971,4, (3), 42–46
4. F. Ambrose and B.W. Dunning Jr., ‘Precious Metals Recovery from Electronic Scrap’ in ‘Proc. Miner. Waste Util. Symp.’, 1980, pp. 184–197
5. D. Takacset al., ‘Industrial Gold Recovery, Especially from Scrap-Electric-Circuit Boards’,Hung. Pat. C1 C22B11/040, June 28, (1980)