2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67831By means of a variational identity of Pohožaev-Pucci-Serrin type for solutions of class $C^1$ recently obtained, we give some necessary conditions for locating the concentration points for a class of quasi-linear elliptic problems in divergence form. More precisely we show that the points where the concentration occurs must be critical, either in a generalized or in the classical sense, for a suitable ground state function.Final revised version, accepted for publicationAnalysis of PDEs35J40; 58E05text