20-51  Chinese Scientific Papers Taken by Major Foreign Referencing Systems by Discipline (2006)
	(piece)
Discipline	Precedence	Pieces
		Total	SCI	EI	ISTP
Total		171748	71351	64936	35461
Mathematics	7	6893	3670	2586	637
Mechanics	16	3016	224	2588	204
Information, Systems Science	25	854	6		848
Physics	3	19051	10239	6620	2192
Chemistry	1	30815	20317	9451	1047
Astronomy	24	876	622	131	123
Earth Science	9	5111	2044	1936	1131
Biology	6	9584	7076	2153	355
Preventive Medicine	36	170	156		14
Basic Medicine	17	2780	1692	134	954
Pharmacy	28	569	505		64
Clinical Medicine	12	3903	3196		707
Traditional Chinese Medicine	40
Special Medicine	31	279	92		187
Agriculture	20	1569	1166	300	103
Forestry	37	39	33		6
Livestock, Veterinary Medicine	37	39	38		1
Aquatic	34	178	171		7
Surveying & Mapping	35	174		114	60
Material Science	5	11043	5929	3867	1247
Engineering & Basic Technology Science	19	2052	651	743	658
Mining	26	780	12	608	160
Energy	21	1543	333	1137	73
Metallurgy, Metallography	13	3706	1218	2250	238
Machinery, Instrument	14	3499	763	2249	487
Power & Electrical Engineering	8	6618	11	5321	1286
Nuclear Technology	30	335	87	124	124
Electronics, Communication & Automation	4	18736	2468	8396	7872
Computer	2	19194	5157	4275	9762
Chemical Engineering	11	4220	936	3029	255
Light Industry & Textile Industry	39	28		26	2
Food	33	217	122	79	16
Civil Construction	10	4368	351	2483	1534
Water Conservancy	29	357	11	296	50
Transportaiton	23	1261	2	1034	225
Aviation and Aerospace	22	1304	101	907	296
Environment	15	3301	1516	1033	752
Security	32	239	7	146	86
Management Science	18	2284	155	918	1211
Others	27	763	274	2	487
a) SCI refers to Science Citation Index, EI refers to Engineering Index, and ISTP refers to Index to Scientific & Technical Proceedings.