@article{10_1090_S0894_0347_03_00420_X,
     author = {Tao, Terence and Wright, James},
     title = {{\dh}{\textquestiondown}^{{\dh}‘} improving bounds for averages along curves},
     journal = {Journal of the American Mathematical Society},
     pages = {605--638},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2003},
     doi = {10.1090/S0894-0347-03-00420-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-03-00420-X/}
}