Rahmann, Sven Dept. of Computational Molecular Biology (Head: Martin Vingron), Max Planck Institute for Molecular Genetics, Max Planck Society;
Rahmann, S. (2003). On the distribution of the number of missing words in Random texts. Combinatorics, Probability and Computing, 12(1), 72-87. doi:10.1017/S0963548302005473.