@article{Ruskey1978a, 
     author = "Ruskey, Frank", 
     doi = "10.1137/0207034", 
     issn = "0097-5397", 
     journal = "SIAM Journal on Computing", 
     keyword = "lattice walks,lexicographic order,ranking algorithms,t-ary trees", 
     language = "en", 
     link = "http://epubs.siam.org/doi/abs/10.1137/0207034", 
     month = "nov", 
     number = "4", 
     pages = "424--439", 
     publisher = "Society for Industrial and Applied Mathematics", 
     title = "Generating T -Ary Trees Lexicographically", 
     uri = "http://epubs.siam.org/doi/abs/10.1137/0207034", 
     volume = "7", 
     year = "1978", 
}

Problems: 389