1. Mloston, G.; Huisgen, R.; Huber, H.; Stephenson, D. S., J.Heterocycl. Chem., in press.
2. Mloston, G.; Huisgen, R.; Polborn, K., Tetrahedron, in press.
3. Geminal coupling constants in methylene groups
4. Progress in NMR Spectroscopy;Lynden-Bell,1967