1. Kushman, L. J. and D. T. Pope. 1968. Procedure for determining intercellular space of roots and specific gravity of sweetpotato root tissue. HortScience 3 (1): 44–45.
2. Kushman, L. J., D. T. Pope and R. J. Monroe. 1966. Estimation of intercellular space and specific gravity of five varieties of sweet potatoes. N. C. Agr. Expt. Sta. Tech. Bull. 175.
3. Kushman, L. J., D. T. Pope and J. A. Warren. 1968. A rapid method of estimating dry-matter content of sweetpotatoes. Amer. Soc. Hort. Sci. Proc. 92: 814–822.
4. Kushman, L. J., D. T. Pope and J. A. Warren. Influence of curing, variety, size of root, evacuation time, and holding time upon the accuracy of intercellular space measurements of sweetpotato roots. (in preparation).
5. Nissen, M. 1958. The weight of potatoes in water. Amer. Potato J. 32: 332–339.