Long-term Evolution of the Outgassing of Comet Hale-Bopp From Radio Observations  
Biver, N., Bockelée-Morvan, D., Colom, P., Crovisier, J., Germain, B., Lellouch, E., Davies, J. K., Dent, W. R. F., Moreno, R., Paubert, G., Wink, J., Despois, D., Lis, D. C., Mehringer, D.,  Benford, D., Gardner, M., Phillips, T. G., Gunnarsson, M., Rickman, H., Winnberg, A., Bergman, P., Johansson, L. E. B.,  Rauer, H. 
1997 Earth, Moon, and Planets 78, 5 
ADS