Weyl formula with optimal remainder estimate of some elastic networks and applications

@article{Ammari2010WeylFW,
  title={Weyl formula with optimal remainder estimate of some elastic networks and applications},
  author={Ka{\"i}s Ammari and Mouez Dimassi},
  journal={Bulletin de la Soci{\'e}t{\'e} Math{\'e}matique de France},
  year={2010},
  volume={138},
  pages={395-413}
}
Nous considerons un reseau de cordes et de poutres d'Euler-Bernoulli. En utilisant une formule de Poisson generalisee et un theoreme tauberien nous prouvons une formule de Weyl avec reste optimal. Comme consequence nous prouvons des resultats d'observabilites et de stabilisations. 
Null boundary controllability of a one-dimensional heat equation with an internal point mass and variable coefficients
In this paper we consider a linear hybrid system which composed by two non-homogeneous rods connected by a point mass and generated by the equation\bea\left\{ \begin{array}{ll}

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