We review an exact analytical resolution method for general one-dimensionalView original: http://arxiv.org/abs/1202.3100
(1D) quantal anharmonic oscillators: stationary Schr\"odinger equations with
polynomial potentials. An exact form of WKB treatment involves spectral (usual)
vs "classical" (newer) zeta-regularisations in parallel. The central results
are Bohr--Sommerfeld-like but exact quantisation conditions for the
eigenvalues, directly drawn from Wronskian identities, and appearing to extend
Bethe-Ansatz formulae of integrable systems.