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Campbell, G S and Calissendorff , C and Williams, J H (1991) Probe for Measuring Soil Specific Heat Using A Heat-Pulse Method. Soil Science Society of America Journal, 55 (1). pp. 291-293. ISSN 0361-5995
Van Evert, F K and Campbell, G S (1994) CropSyst: a collection of object-oriented simulation models of agricultural systems. Agronomy Journal , 86 (2). pp. 325-331. ISSN 0002-1962