Compact embedding of a degenerate Sobolev space and existence of entire solutions to a semilinear equation for a Grushin-type operator
Rendiconti del Seminario Matematico della Università di Padova, Tome 107 (2002), pp. 139-152 
@article{RSMUP_2002__107__139_0,
     author = {Lascialfari, Francesca and Pardo, David},
     title = {Compact embedding of a degenerate {Sobolev} space and existence of entire solutions to a semilinear equation for a {Grushin-type} operator},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {139--152},
     year = {2002},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {107},
     mrnumber = {1926206},
     zbl = {1072.35073},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_2002__107__139_0/}
}
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Lascialfari, Francesca; Pardo, David. Compact embedding of a degenerate Sobolev space and existence of entire solutions to a semilinear equation for a Grushin-type operator. Rendiconti del Seminario Matematico della Università di Padova, Tome 107 (2002), pp. 139-152. https://www.numdam.org/item/RSMUP_2002__107__139_0/

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