Mr. Laydi, STUDY ON SMALL OSCILLATIONS IN 2 LIQUIDS FILLING A FIXED DOMAIN OF ARBITRARY SHAPE, Zeitschrift fur angewandte Mathematik und Physik, 47(6), 1996, pp. 915-925
We study an eigenvalue problem concerning the vibration of an interfac
e separating two non miscible fluids with different densities. We obta
in an abstract theorem of existence generalizing a result due to J. Bo
ujot [4]. We propose a method of approximation by penalization and we
give an estimation of the error.