T.J.B. Boyle, C. Liengsiri, and C. Piewluang, “GENETIC STUDIES IN A TROPICAL PINE - <em>PINUS</em> <em>KESIYA</em> II. GENETIC VARIATION AMONG FOUR POPULATIONS IN NORTHERN THAILAND”, JTFS, vol. 3, no. 4, pp. 308–317, Jun. 1991.