@article{10_4064_sm_120_3_205_218,
     author = {Francisco Marcell\'an and  },
     title = {Operators preserving orthogonality of polynomials},
     journal = {Studia Mathematica},
     pages = {205--218},
     publisher = {mathdoc},
     volume = {120},
     number = {3},
     year = {1996},
     doi = {10.4064/sm-120-3-205-218},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-120-3-205-218/}
}