000 00301nam a2200121Ia 4500
001 MPKV051757
008 120911s9999 xx 000 0 und d
082 _a500
245 _aNature Vol 231
_c;
246 _aNature Vol 231
260 _aLondon
_bMac Millan Journals Ltd.
_c1971
650 _aPure Science
999 _c49760
_d49760