共 4 条
[1]
KILLIAN JR, 1958, SCIENCE, V129, P129
[2]
LUHN HP, 1958, IBM J APR, P159
[3]
COMPARISONS OF 4 TYPES OF LEXICAL INDICATORS OF CONTENT
[J].
AMERICAN DOCUMENTATION,
1961, 12 (02)
:126-&
[4]
RATH GJ, 1959, IBM RES REP RC 184