1. Seasonal Periodicity in Germination of Seeds of Chenopodium album L.
2. D. D. Buhler, R. P. King, S. M. Swinton, J. L. Gunsolus, and F. Forcella .1996 .Field evaluation of a bioeconomic model for weed management in corn (Zea mays)., Weed Sci, 44 :915 –923 .
3. J. Cardina, and D. H. Sparrow .1996 .A comparison of methods to predict weed seedling populations from the soil seedbank., Weed Sci, 44 :46 –51 .
4. L-R. Erviö, 1981 .The emergence of weeds in the field., Ann. Agric. Fenniae, 20 :292 –303 .
5. A review of work done to forecast pest insect attacks in UK horticultural crops