D. Knuth. CSLI Lecture Notes Number 27 Stanford University Center for the Study of
Language and Information, Stanford, CA, USA, (1992)Distributed by the University of Chicago Press..
M. Biró, E. Bodroghy, A. Bor, E. Knuth, and L. Kovács. Decision Support Systems: Experiences and Expectations, volume A-9 of IFIP Transactions, page 103-113. North-Holland, (1992)