000 00269nam a22001097a 4500
003 OSt
008 231229b |||||||| |||| 00| 0 eng d
082 _aP505
_bP87
245 _aProceeding of National Academy of Science U.S.A. - Vol.78
260 _c1981
942 _2ddc
_cBK
999 _c35352
_d35352