@article{JFAA_1998__4_2_59557,
     author = {J.L. Denny and C.K. Abbey},
     title = {Partial {Sums} of {Orthonormal} {Bases} {Preserving} {Positivity} - and {Martingales.}},
     journal = {The journal of Fourier analysis and applications [[Elektronische Ressource]]},
     pages = {151},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1998},
     zbl = {0913.42025},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/JFAA_1998__4_2_59557/}
}