1. BrØnstad JO, Friestad HO (1984) Behaviour of glyphosate in the aquatic environment. In: Grossbard E, Atkinson D (eds) The Herbicide Glyphosate. Butterworths. London, Boston, Durban, Singapore, Sidney, Toronto, Wellington: 200
2. Crosby DG (1976) Herbicide photodecomposition. In: Kearney PC, Kaufman DD (eds) Herbicides, chemistry, degradation and mode of action. Marcel Dekker. Inc. New York, Basel. Vol 2:835
3. Friestad HO, BrØnstad JO (1985) Improved polarographic method for determination of glyphosate herbicide in crops, soil and water. J. Assoc. Off. Anal. 68:76
4. Hegg K (1983) Daily values of global radiation, totally and divided in 5 wavelength bands, from 7 stations in the Nordic countries. Dept. of Phys. and Met., Agr. Univ. of Norway
5. Hensley DL, Beverman DSN, Carpenter PL (1978) The inactivation of glyphosate by various soils and metal salts. Weed Res. 18:287