1. Analytical Research, Rohm and Haas Company, 727 Norristown Road, Spring House, Pennsylvania 19477 and Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085
2. Theoretical Separation Science Laboratory, Rohm and Haas Company, 727 Norristown Road, Spring House, Pennsylvania 19477
3. Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085