Physical and chemical factors associated with the reduction or delay of seed germination and seedling emergence of bull thistle, Cirsium vulgare (Savi) Ten. under leaf litter.

Downs, M.P. and Cavers, P.B. (2002). "Physical and chemical factors associated with the reduction or delay of seed germination and seedling emergence of bull thistle, Cirsium vulgare (Savi) Ten. under leaf litter.", Écoscience, 9(4), pp. 518-525.