TY  - JOUR
PB  - American Physical Society
ID  - 10.1103/PhysRevFocus.8.9
TI  - A Constant that Isn’t Constant
JF  - Physical Review Focus
JA  - Phys. Rev. Focus
J1  - FOCUS
VL  - 8
IS  - 
SP  - 9
EP  - 
PY  - 2001/08/09/
UR  - http://link.aps.org/doi/10.1103/PhysRevFocus.8.9
A1  - Berg, Rob van den
ER  -