Salem, A. T., M. A. Shaheen, A. Y. A. -Aal, and M. A. Abdel-Mohsen,
"A comparative study on N-use efficiency of Crimson Seedless, Superior and Thompson Seedless grapevine varieties",
J. Agric. Sci. Mansoura Univ., vol. 32 , issue 60, pp. 5219-5231, 2007.