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Engineering a longer life Sir — In the excellent article “Eighteenninety-nine and all that”, Isambard Kingdom Brunel is said to have died in 1869 (Nature 397, 15–18; 1999). Would that he had! We would have had ten years more of one of the world’s greatest engineers. Nigel L. Firth Nova Scotia Agricultural College, Truro, Nova Scotia B2N 5E3, Canada
Managing SOHO Sir — Tony Reichhardt’s News article “Rescued satellite to get more managers” is almost entirely accurate in its explanation of the concerns of operating a complex spacecraft during a period of pressure to reduce the costs of flight operations (Nature 396, 399; 1998). But it is misleading in stating that “Management of the $1 billion satellite was to have merged with that of the other projects in the … ISTP programme to save money”. NATURE | VOL 398 | 4 MARCH 1999 | www.nature.com
0.85 Proportion undercited
Sir — The assessment of research quality is increasingly based on impact factors and citation analyses of published work. But there are possible biases in these measures1–4. Is the fact that Italian, French, German and Japanese publications received a less than average share of citations due to a lack of quality3 or to systematic bias1? Further analysis of the data in ref.1 on papers by Italian scientists reveals a strong positive relationship between journal impact factor class (IFC) and proportion of publications undercited (Fig. 1). Furthermore, the proportion of publications undercited in the highest IFC is significantly greater than the corresponding proportion in the lowest IFC (x21 4 4.89, P 4 0.027). These effects strengthen the negative implications of underciting for Italian scientists: not only is their work undercited in general but, as the quality of their work increases, it is less recognized! These results clearly support Paris et al.’s conclusions1 that undercitation does not result from substandard publications3. What drives the undercitation? I suggest that incorrect citation may be one factor. Price2 has analysed the citations of three highly cited publications, with astonishing
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