Some properties of Riesz means and spectral expansions. (With an appendix by R. A. Gustafson). Fulling, S.A. — 1999 Electronic Journal of Differential Equations (EJDE) [electronic only]
Distributional asymptotic expansions of spectral functions and of the associated Green kernels. Estrada, R.; Fulling, S.A. — 1999 Electronic Journal of Differential Equations (EJDE) [electronic only]
Spectral Riesz-Cesàro means: How the square root function helps us to see around the world. Fulling, S.A.; Gorbar, E.V.; Romero, C.T. — 2000 Electronic Journal of Differential Equations (EJDE) [electronic only]