@misc{Bragstad_Ole_Sivert_(1868-1927)_Usymmetriske,
 author={Bragstad, Ole Sivert (1868-1927)},
 howpublished={online},
 publisher={I Kommission Hos F. Bruns Bokhandel},
 language={nor},
 type={książka},
 title={Usymmetriske trefasesystemer},
 keywords={silniki ansychroniczne, matematyka},
}