000 00305nam a2200121Ia 4500
008 251112s9999||||xx |||||||||||||| ||und||
040 _aCNCLSA
245 0 _aProceeding of the national academy of sciences
260 _cSeptember, 1981
_aU. S. A
300 _aP.5261-6560
300 _bV.78
942 _cJRBV
999 _c35661
_d35661