L. J. Wiles WILES, L. J., GOLD, H. J., & WILKERSON, G. G. (1993). MODELING THE UNCERTAINTY OF WEED DENSITY ESTIMATES TO IMPROVE POSTEMERGENCE HERBICIDE CONTROL DECISIONS. WEED RESEARCH, 33(3), 241–252. https://doi.org/10.1111/j.1365-3180.1993.tb01938.x Wiles, L. J., & Wilkerson, G. G. (1991). Modeling competition for light between soyabean and broadleaf weeds. Agricultural Systems, 35(1), 37. https://doi.org/10.1016/0308-521X(91)90145-Z