共 4 条
[1]
CRON AB, 1916, J AM SOC AGRON, V8, P237
[2]
Kempton FH, 1913, US BUR PL IND B, V278, P1
[3]
STRATTON ME, 1923, CORNELL U MEM, V69, P1
[4]
WALKER ER, 1906, U NEBRASKA STUDIES, V6, P203