Orthogonal.

Convergence problems of orthogonal series Alexits, Gyo"rgy 1961 Convergence problems of orthogonal series Alexits, György 1961 Fourier series and boundary value problems Brown, James Ward 2012 Fourier series and boundary value problems Brown, James Ward 2008 Fourier series and boundary value problems Churchill, Ruel V. 2008 Fourier series and boundary value problems Brown, James Ward 2003 Fourier series and boundary value problems Churchill, Ruel Vance 1978 Fourier series and boundary value problems Churchill, Ruel V. 1987 Fourier series and boundary value problems Churchill, Ruel V. 1963 Triangular orthogonal functions for the analysis of continuous time systems Deb, Anish 2007