1. 1. A. Anane. O.Chakrone. M.Moussa, Spectrum of one dimensional p-laplacian operator with indefinite weight, EJQTDE, (2002), No 17, p. 1-11.
2. 2. A. Anane, Simplicité et isolation de la première valeur propre du p-laplacen avec poids, C.R.A.S, Paris, t. 305(1987), p. 725-728.
3. 3. A. Anane. N.Tsouli, On the second eigenvalue of the p-laplacian, Nonlinear Partial Differential Equations, Pitman Research, Notes 343(1996), p. 1-9.
4. 4. P. A. Binding. P. J. Browne. Y. X. Huang. R. H. Picard, On eigencurves of elliptic boundary value problems, Proc. Roy. Soc. Edim. 118A, (1991), p. 161-171
5. 5. P. A. Binding. Y. X. Huang, The principal eigenvalue of the plaplacian, Diff. Int. Equa. 8(1995), p. 405-414.