Sustainable production of barley and wheat by intercropping common vetch A.S. Lithourgidis, K.V. Dhima, I.B. Vasilakoglou, C.A. Dordas and M.D. Yiakoulaki Agron. Sustain. Dev., 27 2 (2007) 95-99 Published online: 23 March 2007 DOI: 10.1051/agro:2006033