1. [1] van den Berg, Michiel; Srisatkunarajah, Sivakolundu Heat equation for a region in ℝ 2 , J. Lond. Math. Soc., Volume 37 (1988), pp. 119-127
2. [2] Berger, Marcel Sur le spectre d’une variété riemannienne, C. R. Math. Acad. Sci. Paris, Volume 263 (1966), p. A13-A16
3. [3] Berger, Marcel Le spectre des variétés riemanniennes, Rev. Roum. Math. Pures Appl., Volume 13 (1968), pp. 915-931
4. [4] Berger, Marcel Eigenvalues of the Laplacian, Global Analysis (Proceedings of Symposia in Pure Mathematics) Volume 16, American Mathematical Society, 1970, pp. 121-125
5. [5] Berger, Marcel; Gauduchon, Paul; Mazet, Edmond Le spectre d’une variété riemannienne, Lecture Notes in Mathematics, Volume 194, Springer, 1971