TY - BOOK AU - Berard, Pierre H., AU - Besson, G., TI - Spectral geometry: Direct and inverse problems T2 - Lecture notes in mathematics ; SN - 3540167889 AV - QA649 B46 PY - 1986/// CY - Berlin PB - Springer Verlag KW - Valores propios KW - TeorĂ­a de operadores KW - GeometrĂ­a de Riemann ER -