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1
Lindell, M. K., | Sage Publications | 2000 ,
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3
Welch, E B, 539.9-W439e | Cambridge University Press | 1980 539.9-W439e,
4
Lindell, Ismo V, 420.1-L743m | Institute of Electrical and Electr | 1992 420.1-L743m,