共 18 条
[2]
CECIL JT, 1978, THESIS U WYOMING LAR
[4]
COPLEY PW, 1972, THESIS COLORADO STAT
[6]
DITTERLINE RL, 1975, MONTANA AGR EXP STN, V681
[7]
ESLICK RF, 1968, MONTANA AGR EXP STN, V627
[8]
GAUDET DA, 1978, THESIS MONTANA STATE
[9]
Hardy R. W. F., 1976, Symbiotic nitrogen fixation in plants., P421