In the past V.O. Sadras has collaborated on articles with D.J. Connor and S.P. Milroy. One of their most recent publications is Dynamics of rooting and root-length: leaf-area relationships as affected by plant population in sunflower crops. Which was published in journal Field Crops Research.
More information about V.O. Sadras research including statistics on their citations can be found on their Copernicus Academic profile page.