The authors establish bifurcation from eigenvalues of the Grushin operator and prove that the number of nontrivial solutions is at least twice the multiplicity in a left neighborhood of each eigenvalue for this critical Choquard problem.
Tricomi, Sulle equazioni lineari alle derivate parziali di 2 o ordine di tipo misto, Mem Lincei 14 (1923) 133-247
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Bifurcation and multiplicity results for critical Grushin-Choquard problems
The authors establish bifurcation from eigenvalues of the Grushin operator and prove that the number of nontrivial solutions is at least twice the multiplicity in a left neighborhood of each eigenvalue for this critical Choquard problem.