000			00307nam a2200121Ia 4500
008			251112s9999||||xx |||||||||||||| ||und||
040			_aCNCLSA
245		0	_aProceeding of the national academy of sciences
260			_cNovember 1, 1993 _aU. S. A
300			_aP.9741-10892
300			_bV.90
942			_cJRBV
999			_c33291 _d33291