S. Pongthornpruek, S. Pampasit, K. Promtep, and P. Nabheerong, “The diversity of pteridophytes along a natural trial at Phu Soi Dao national park, Phitsanulok province, Thailand”, Asia Pac J Sci Technol, vol. 13, no. 8, pp. 895–905, Apr. 2017.