@article{700456,
     title = {On a ground state and two symmetric ground state solutions in a domain},
     booktitle = {Proceedings of Equadiff 11},
     series = {GDML\_Books},
     publisher = {Comenius University Press},
     address = {Bratislava},
     year = {2007},
     pages = {559-566},
     url = {http://dml.mathdoc.fr/item/700456}
}

Wang, Hwai-Chiuan. On a ground state and two symmetric ground state solutions in a domain, dans Proceedings of Equadiff 11, GDML_Books,  (2007), pp. 559-566. http://gdmltest.u-ga.fr/item/700456/