author = { Abramson, Harvey D. },

title = { A note on a result of knuth or identities grow on trees },

publisher = {Elsevier BV},

isbn = {0021-9800},

keywords = { Discrete Mathematics and Combinatorics , Computational Theory and Mathematics , Theoretical Computer Science },

year = {1969},

url = { http://slubdd.de/katalog?TN_libero_mab2 }