Rootstock influence (1965-1980) on yield, yield efficiency and tree size of 'Bartlett' and 'd'Anjou' pear
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[1] F. Larsen,et al. Rootstock influence on leaf and fruit mineral status of ‘Bartlett’ and ‘d'Anjou’ pear , 1984 .
[2] M. N. Westwood. Temperate Zone Pomology , 1978 .