English Beginner Catalan addendum (to: Enumerative Combinatorics Volume 2) Richard P. Stanley 2013 View book
English Beginner Counting: The Art of Enumerative Combinatorics George E. Martin (auth.) 2001 View book
English Beginner Algorithms on Strings, Trees and Sequences - Computer Science and Computational Biology Gusfield G 1997 View book