au.\*:("HELFAND GE")
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ECONOMIC, ENVIRONMENTAL, AND ENERGY IMPLICATIONS OF ENGINE PING: A PRELIMINARY ANALYSISCLARK CL; DARBY WP; HELFAND GE et al.1981; INT. J. ENVIRON. STUD.; ISSN 0020-7233; GBR; DA. 1981; VOL. 16; NO 2; PP. 107-115; BIBL. 20 REF.Article
