TY  - BOOK
TI  - Proceedings of the national academy of sciences of the United States of America
T2  - 67
U1  - 500 
PY  - 1970///
KW  - Proceedings
KW  - National Academy of Sciences--USA | PNAS--Periodicals
N1  - PS - 70 / 120076 - Q / 22.12.0969; Multidisciplinary Science; USA; National Academy of Sciences; Research
ER  -