G. Adjers, J. Kuusipalo, S. Nduka, and A. Otsamo, “PLANTING <em>DURIO</em> <em>ZIBETHINUS</em> IN ABANDONED SHIFTING CULTIVATION AREAS: RESULTS THREE YEARS AFTER PLANTING”, JTFS, vol. 9, no. 3, pp. 315–320, Mar. 1997.