Quiring, S. M; Papakryiakou, T. N. (2003). "An evaluation of agricultural drought indices for the Canadian prairies". Agricultural and Forest Meteorology. 118 (1–2): 49–62. Bibcode:2003AgFM..118...49Q. doi:10.1016/S0168-1923(03)00072-8.
Quiring, S. M; Papakryiakou, T. N. (2003). "An evaluation of agricultural drought indices for the Canadian prairies". Agricultural and Forest Meteorology. 118 (1–2): 49–62. Bibcode:2003AgFM..118...49Q. doi:10.1016/S0168-1923(03)00072-8.
Williams, G. D. V.; Joynt, M. I.; McCormick, P. A. (1975). "Regression analyses of Canadian prairie crop-district cereal yields, 1961–1972, in relation to weather, soil, and trend". Canadian Journal of Soil Science. 55 (1): 43–53. Bibcode:1975CaJSS..55...43W. doi:10.4141/cjss75-007.
Gregorich, E.G.; Anderson, D.W. (December 1985). "Effects of cultivation and erosion on soils of four toposequences in the Canadian prairies". Geoderma. 36 (3–4): 343–354. Bibcode:1985Geode..36..343G. doi:10.1016/0016-7061(85)90012-6.
Quiring, S. M; Papakryiakou, T. N. (2003). "An evaluation of agricultural drought indices for the Canadian prairies". Agricultural and Forest Meteorology. 118 (1–2): 49–62. Bibcode:2003AgFM..118...49Q. doi:10.1016/S0168-1923(03)00072-8.
Quiring, S. M; Papakryiakou, T. N. (2003). "An evaluation of agricultural drought indices for the Canadian prairies". Agricultural and Forest Meteorology. 118 (1–2): 49–62. Bibcode:2003AgFM..118...49Q. doi:10.1016/S0168-1923(03)00072-8.
Williams, G. D. V.; Joynt, M. I.; McCormick, P. A. (1975). "Regression analyses of Canadian prairie crop-district cereal yields, 1961–1972, in relation to weather, soil, and trend". Canadian Journal of Soil Science. 55 (1): 43–53. Bibcode:1975CaJSS..55...43W. doi:10.4141/cjss75-007.
Gregorich, E.G.; Anderson, D.W. (December 1985). "Effects of cultivation and erosion on soils of four toposequences in the Canadian prairies". Geoderma. 36 (3–4): 343–354. Bibcode:1985Geode..36..343G. doi:10.1016/0016-7061(85)90012-6.
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