@misc{Churchill_Ruel_Vance_(1899-1987)._Fourier,
 author={Churchill, Ruel Vance (1899-1987).},
 howpublished={online},
 publisher={McGraw-Hill Book Company},
 language={eng},
 type={książka},
 type={dokument piśmienniczy},
 title={Fourier series and boundary value problems},
}