1. 1) Noboru Yuasa, Yoshio Kasai, Isamu Matsui: Inhomogeneous distribution of the moisture content and porosity from the surface layer to internal parts of dried concrete, Journal of Structural and Construction Engineering, AIJ, No.509, pp.9-16, 1998.7(in Japanese) 湯浅昇, 笠井芳夫, 松井勇：乾燥を受けたコンクリートの表層から内部にわたる含水率, 細孔構造の不均質性, 日本建築学会構造系論文集, 第 509 号, pp.9-16, 1998.7(DOI: https://doi.org/10.3130/aijs.63.9_5 )
2. 2) Noboru Yuasa, Yoshio Kasai and I. MATSUI: Inhomogeneous distribution of compressive strength from the surface layer to internal parts of concrete in structures, CANMET/ACI/JCI, Fifth International Conference on Durability of Concrete, pp.269-281, 2000.6
3. 4) Yoshio Kasai, Naoharu Ikeda：Test method of concrete（last volume）, Gizyutsushoin, pp.148-160, 1993.6(in Japanese) 笠井芳夫, 池田尚治：コンクリートの試験方法（下）, 技術書院, pp.148-160, 1993.6
4. 5) Ministry of Land, Infrastructure, Transport and Tourism The Touhoku Regional Development Bureau：Guide of quality assurance of a concrete structure（Draft）, （The tunnel lining concrete piece）, Ministry of Land, Infrastructure, Transport and Tourism The Touhoku Regional Development Bureau, pp41-48, 2022.6(in Japanese) 国土交通省東北地方整備局：コンクリート構造物の品質確保の手引き（案）, （トンネル覆工コンクリート編）, 国土交通省東北地方整備局, pp41-48, 2022.6
5. 6) J.W.Figg: Methods of Measuring the Air and Water Permeability of Concrete, Magazine of Concrete Research, Vol.25, No.85, pp.213-218, 1973