000 00272nam a2200085Ia 4500
001 MPKV107175
008 120911s9999 xx 000 0 und d
245 _aProceedings of the National Academy of Science Vol. 83 Part 1-4
_c;
260 _aUSA
_bNational Academy of Science
_c1986
999 _c70551
_d70551