000 00300nam a2200121 a 4500
005 20140414132113.0
008 110817s19uu xx 00 eng d
050 _aREF 503
_bK52 1990
245 _aKey book.
260 _aSingapore :
_bWorl book,
_c1990.
440 _aYoung Scientist
541 _eM6745
999 _c114838
_d114838