@article{10_4064_ap_53_2_161_183,
     author = {Aleksander Strasburger},
     title = {Differential operators of gradient type associated with spherical harmonics},
     journal = {Annales Polonici Mathematici},
     pages = {161--183},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1991},
     doi = {10.4064/ap-53-2-161-183},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-53-2-161-183/}
}