@article{ETNA_2008__31__a21,
     author = {Dost\'al, Zden\v{e}k},
     title = {On the decrease of a quadratic function along the projected-gradient path},
     journal = {Electronic transactions on numerical analysis},
     pages = {25--29},
     publisher = {mathdoc},
     volume = {31},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2008__31__a21/}
}