@article{AM2_1977__15_136629,
     author = {A. Sharma and M.A. Botto},
     title = {Averaging interpolation on sets with multiplicities.},
     journal = {Aequationes mathematicae},
     pages = {63--72},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0356.41001},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136629/}
}