Urushibara-Yoshino, Kazuko, et al. “The Solution Rate of Limestone Tablets and CO2 Measurements in Limestone Areas of Japan”. Geografia Fisica E Dinamica Quaternaria, vol. 3, no. 4, Jan. 1998, pp. 35-39, https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1193.