no. 2
Symmetry breaking for a class of semilinear elliptic problems
Annales de l'I.H.P. Analyse non linéaire, Tome 7 (1990) no. 2, pp. 107-112. 
@article{AIHPC_1990__7_2_107_0,
     author = {Srikanth, P. N.},
     title = {Symmetry breaking for a class of semilinear elliptic problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {107--112},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {2},
     year = {1990},
     mrnumber = {1051231},
     zbl = {0729.35013},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1990__7_2_107_0/}
}
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Srikanth, P. N. Symmetry breaking for a class of semilinear elliptic problems. Annales de l'I.H.P. Analyse non linéaire, Tome 7 (1990) no. 2, pp. 107-112. http://www.numdam.org/item/AIHPC_1990__7_2_107_0/

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[2] H. Hofer, The Topological Degree at a Critical Point of Mountain Pass Type, A.M.S. Summer Institute, Berkeley, 1985. | MR | Zbl

[3] Yan-Yan Li, Ph. D. Thesis, Courant Institute, 1988.

[4] M. Ramaswamy and P.N. Srikanth, Symmetry Breaking for a Class of Semilinear Elliptic Problems, T.A.M.S., 304, NO2, 1987, pp. 839-845. | MR | Zbl

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