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E. A. Coleman, R. J. Bula and R. L. Davis. (1966). Electrophoretic and Immunological Comparisons of Soluble Root Proteins of Medicago sativa L. Genotypes in the Cold Hardened and Non-Hardened Condition. Plant Physiology, 41(10), 1681–1683+1685. doi:10.2307/4260902 
10.2307/4260902