1. Le Suer, W. M., U.S. Patent No. 2247534 (Lubrizol Corp.).
2. De Lind van Vijngarden, G., Kremers, A. P. M., and Lameree, J., EP No. 0267658 (Shell International).
3. Cleverley, J. H., Marsh, J. F., and Swietlik, J. M., EP No. 0323087 (Exxon Chemical Corp).
4. Jao, T. C., U.S. Patent No. 4780224 (Texaco Corp.).
5. Characterization of calcium alkylaryl sulfonates containing encapsulated solids