AKAIKE, H. Information theory as an extension of the maximum likelihood principle. Proc. 2nd International Symposium on Information Theory, 1973. 1973, 267-281
HIRAO, T. Text summarization challenge 3. Text summarization evaluation at NTCIR Workshop 4. Working Notes of the 4th NTCIR Workhop Meeting, 2004. 2004, 407-411