000 00271nam a2200085Ia 4500
001 MPKV107176
008 120911s9999 xx 000 0 und d
245 _aProceedings of the National Academy of Science Vol. 83 Part5-8
_c;
260 _aUSA
_bNational Academy of Science
_c1986
999 _c70552
_d70552