1. J.D. Idol, US 2 940 580 (1959), to Standard Oil Company
2. J.L. Callahan, R.W. Foreman, F. Veatch, US 2 941 007 (1960), to Standard Oil Company
3. G.W. Hearne, K.E. Furman, US 2 991 320 (1961), to Shell Oil Co
4. X-ray and ultraviolet-photoelectron spectra of bismuth molybdate catalysts