@article{10_4153_S0008414X20000826,
     author = {Sargent, Meredith and Sola, Alan A.},
     title = {Optimal approximants and orthogonal polynomials in several variables},
     journal = {Canadian journal of mathematics},
     pages = {428--456},
     year = {2022},
     volume = {74},
     number = {2},
     doi = {10.4153/S0008414X20000826},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000826/}
}