Gadella, T., P. Maas, P. M. Jørgensen, P. van Welzen, F. Obermüller, D. Daly, and N. Rønsted. “IN MEMORIAM: CEES (‘KEES’) BERG, JULY 2nd 1934 – AUGUST 31st, 2012”. Thai Forest Bulletin (Botany), no. 40, Nov. 2014, pp. 4-8, https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24118.