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Link to original content: https://dblp.dagstuhl.de/rec/journals/ita/TangB91.xml
Shouwen Tang Ronald V. Book Reducibilities on tally and sparse sets. 293-302 1991 25 RAIRO Theor. Informatics Appl. db/journals/ita/ita25.html#TangB91 https://doi.org/10.1051/ita/1991250302931