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3. 3) 藤井眞透: 骨材の最大密度の粒度に就て, 内務省土木試験場報告第三十七号抜粋, 1934頃
4. 4) Vanuat, M. et Papadakis, M.: Contrôle et essai de ciments, mortiers, bétons, Eyrolles, pp. 284 (referred from the paper of Bolomey, J.), 1961.
5. 5) Plum, N. M.: The Predetermination of Water Requirement and Optimum Grading of Concrete, Building Research Studies No. 3, Danish National Institute of Building Research, 1950.