@article {IOPORT.50106516,
    author       = {Remogna, Sara and Sablonni\`ere, Paul},
    title        = {On trivariate blending sums of univariate and bivariate quadratic spline quasi-interpolants on bounded domains},
    year         = {2011},
    journal      = {Computer Aided Geometric Design},
    volume       = {28},
    number       = {2},
    pages        = {89-101},
    doi          = {10.1016/j.cagd.2010.12.002},
    identifier   = {50106516},
}