TY  - JOUR
AU  - Lawrence, Steve
TI  - Free online availability substantially increases a paper's impact
JA  - Nature
PY  - 2001/05/31/print
VL  - 411
IS  - 6837
SP  - 521
EP  - 521
PB  - Nature Publishing Group
SN  - 0028-0836
UR  - http://dx.doi.org/10.1038/35079151
M3  - 10.1038/35079151
N1  - 10.1038/35079151
ER  -