Anderson, M.K. and N.L. Taylor.
1973. Effect of temperature on intra- and inter-specific crosses of diploid and tetraploid red clover (Trifolium pratense L.).
Theor. Appl. Gen., 44:73-76. http://www.uky.edu/Ag/Agronomy/Department/CloverGC/selectedliterature.htm
Authors: Norman Taylor