Ross et al., 2009. Can. J. Plant Sci., 89: 469-476

Ross, S. M. ; King, J. R. ; Izaurralde, R. C. ; O'Donovan, J. T., 2009. The green manure value of seven clover species grown as annual crops on low and high fertility temperate soils. Can. J. Plant Sci., 89: 469-476