1. Root studies;Atkinson;Rep. E. Malling Res. Stn.,1973
2. Root studies;Atkinson;Rep. E. Malling Res. Stn.,1974
3. Water use and the pattern of rooting in relation to increasing density of planting;Atkinson,1974
4. Optimum tree density for apple orchards;Cain;HortScience,1970