共 25 条
[2]
[Anonymous], 1982, SAS USERS GUIDE
[3]
BECKER WA, 1975, MANUAL QUANTITATIVE, P28
[7]
FLEMING WN, 1976, 6TH P TECH C ART INS, P88
[10]
HULTNAS C, 1959, ACTA AGR SCAND S, V9, P82