Joint paper

GRUNDY AC, PETERS NCB, RASMUSSEN IA, HARTMANN K M, SATTIN M, ANDERSSON L, MEAD A, MURDOCH AJ, FORCELLA F (2003) Emergence of Chenopodium album and
Stellaria media of different origins under different climatic conditions. Weed Research 43,163-176.

You can see the abstract of this paper through the Blackwell web site at:  http://www.blackwell-synergy.com/links/doi/10.1046/j.1365-3180.2003.00330.x/abs/