1. Carbon Monoxide in the Earth's Atmosphere: Increasing Trend
2. Scheinberg, I. H. (1972) US Patent 3, 693, 327
3. Scheinberg, I. H. (1977) US Patent 4, 071, 037
4. Turner, A. P. F., Aston, W. J., Bell, J. M., Colby, J., Davis, G., Higgins, I. J. and Hill, H. A. D. Anal. Chem. Acta., in press