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    • Green's functions for sturm-liouville problems on directed tree graphs 

      Ramirez, Jorge M.
      Let $\Gamma$ be geometric tree graph with $m$ edges and consider the second order Sturm-Liouville operator $\mathcal{L}[u]=(-pu')'+qu$ acting on functions that are continuous on all of $\Gamma$, and twice continuously ...
      Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas.