000			00301nam a2200121Ia 4500
008			251112s9999||||xx |||||||||||||| ||und||
040			_aCNCLSA
245		0	_aProceeding of the national academy of sciences
260			_cMarch, 1981 _aU. S. A
300			_aP.1309-2648
300			_bV.78
942			_cJRBV
999			_c34502 _d34502