共 6 条
[3]
KLIEFOTH RA, 1964, CONTRIB BOYCE THOMPS, V22, P283
[4]
LEHMAN RUSSELL S., 1932, JOUR ECON ENT, V25, P949, DOI 10.1093/jee/25.5.949
[6]
Wade JS, 1923, J AGRIC RES, V26, P0547