TY  - JOUR
AU  - Tang, Min
TI  - Relatively prime sets and a phi function for subsets of $\{1, 2,\dots, n\}$
JO  - Journal of integer sequences
PY  - 2010
VL  - 13
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JIS_2010__13_7_a3/
LA  - en
ID  - JIS_2010__13_7_a3
ER  -