共 8 条
- [1] JOFFE A., 1958, S AFRICAN JOUR AGRIC SCI, V1, P435
- [2] MADSEN GC, 1947, CAV VAR KLONDIKE BOT, V109, P120
- [3] Nielsen CS, 1942, BOT GAZ, V104, P99, DOI 10.1086/335110
- [4] NJOKU E., 1958, JOUR WEST AFRICAN SCI ASSOC, V4, P99
- [6] ROBERTS RH, 1963, 123 COLL INT CENT NA, P611
- [7] Salisbury F. B., 1963, FLOWERING PROCESS
- [8] WIENK JF, 1963, WALP MEDED LANDBOUWH, V63, P1