TY  - JOUR
AU  - Ufnarovski, Victor
AU  - Åhlander, Bo
TI  - How to differentiate a number
JO  - Journal of integer sequences
PY  - 2003
VL  - 6
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JIS_2003__6_3_a2/
LA  - en
ID  - JIS_2003__6_3_a2
ER  -