The article was first published in JSAE Review (21:4, pp 511-;16), an official journal of the Society of Automotive Engineers of Japan. Inc. It was republished in the previous issue of Materials Today (3:4/4:1,pp 30-34) when the original source was inadvertently omitted. We apologize for this and for any inconvenience caused.

JSAE Review is the international journal on automotive technology, and is the only publication in English exclusively presenting technical papers on various aspects of the automotive industry in Japan. For further details and a free electronic sample copy visit

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DOI: 10.1016/S1369-7021(01)80101-2