Succinct ordinal trees with level-ancestor queries. - Richard F. Geary; Rajeev Raman; Venkatesh Raman 001 (ACM Trans. Algorithms, 2006)

A simple optimal representation for balanced parentheses. - Richard F. Geary; Naila Rahman; Rajeev Raman; Venkatesh Raman 001 (Theor. Comput. Sci., 2006)