@article{JCA_2010_17_2_JCA_2010_17_2_a5,
     author = {A. J. Guirao and M. Ivanov and S. Lajara},
     title = {On {Moduli} of {Smoothness} and {Squareness}},
     journal = {Journal of convex analysis},
     pages = {441--449},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JCA_2010_17_2_JCA_2010_17_2_a5/}
}