共 4 条
[1]
BORDON AD, 1934, CALIF AG EXP STA B, V579
[3]
SMITH RALPH H., 1931, JOUR ECONOMIC ENT, V24, P985, DOI 10.1093/jee/24.5.985
[4]
SMITH RH, 1932, CALIF AG EXP STA B, V527