TY - JOUR AU - Littlejohn, L.L. AU - Zettl, A. TI - Left-definite variations of the classical Fourier expansion theorem JO - Electronic transactions on numerical analysis PY - 2007 SP - 124 EP - 139 VL - 27 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ETNA_2007__27__a3/ LA - en ID - ETNA_2007__27__a3 ER -