1. Mathematical Analysis;Apostol,1974
2. Prefix and perfect languages;Beauquier,1983
3. Prefix-free words of length n over m letters: two-sided well-balanced parentheses and palindromes;Beauquier,1986
4. Prefix-free words of length n over m letters: two-sided well-balanced parentheses and palindromes;Beauquier,1986
5. Advanced Combinatorics;Comtet,1974