L. Tuyen, P. Hue, N. Hue, and D. Ha, “The pick-off annihilation process of ortho-positronium in zeolite ZSM-5 and Silicalite-1 under the influence of gas environment and adsorbed water”, VNUHCM Journal of Natural Sciences, vol. 9, no. 4, pp. 3466-3472, Dec. 2025.