1. Aamio, T., McCullough, K., Trofymow, J. A. (1996) Fate of urea and ureaformaldehyde nitrogen in a one-year laboratory incubation with Douglas-fir forest floor. Soil Biol. Biochem. 28, 1407–1415.
2. Alexander, A., Helm, H.-U. (1990) Ureaform as a slow-release fertilizer: a review. Z. Pflanzenernähr. Bodenk. 153, 249–255.
3. Bender, R. A., Jannsen, K. A., Resnick, A. D., Blumenberg, M., Foor, F., Magasanik, B. (1977) Biochemical parameters of glutamine synthetase from Klebsiella aerogenes. J. Bactehol 129, 1001–1009.
4. Bizet, C, Bizet, J. (1995) Comparative susceptibility of Ochrobactrum anthropi, Agrobacterium tumefaciens, Alcaligenes faecalis, Alcaligenes denitrificans subsp. denitrificans, Alcaligenes denitrificans subsp. xylosidans and Bordetella hronchiseptica against 35 antibiotics including 17 beta-lac-tams. Pathol Biol (Paris) 43, 258–263.
5. Fuller, W. H., Clark, K. G. (1947) Microbiological studies on urea-formaldehyde preparations. Soil Set Soc. Amer. Proc. 12, 198–202.