TY  - SER
ED  -  PNAS
ED  -  The National Academy of Sciences.
TI  -  Proceedings of the National Academy of Sciences of the United States of America
SN  -  0027-842
U1  -  PER 506.273 N3P 
PY  - 1952///-
CY  -  Washington : 
PB  -  The National Academy of Sciences, 
KW  -  Science
N1  -  Vol. 105, no.48, (December, 2008)
ER  -