@article{ITA_1991__25_3_293_0,
     author = {Tang, Shouwen and Book, Ronald V.},
     title = {Reducibilities on tally and sparse sets},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {293--302},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {3},
     year = {1991},
     mrnumber = {1119046},
     zbl = {0731.68039},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1991__25_3_293_0/}
}