References
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- Tyler , C. and Geake , F. H. 1960 . Studies on egg shells. XIII. Influence of individuality, breed, season and age on certain characteristics of egg shells. . J. Sci. Food Agric. , 11 : 535 – 547 .
- Tyler , C. and Geake , F. H. 1961 . Studies on egg shells. XV. Critical appraisal of various methods of assessing shell thickness. . J. Sci. Food Agric. , 12 : 281 – 289 .