共 5 条
[1]
BOULDIN D. R., 1959, SOIL SCI SOC AMER PROC, V23, P276
[2]
BOULDIN D. R., 1958, SOIL SCI SOC AMER PROC, V22, P124
[4]
LAWTON K., 1956, SOIL SCI, V82, P465, DOI 10.1097/00010694-195612000-00003
[5]
LEHR J. R., 1958, SOU SCI SOC AMER PROC, V22, P29