An inverse problem for a differential pencil using nodal points as data (Q480813)

A solution of the inverse nodal problem is obtained for the boundary value problem \[ -u''+(2\lambda p(x)+q(x))u=\lambda^2 u,\; x\in (0,\pi), \] \[ u'(0)-hu(0)+\gamma u(\pi)=0,\; u'(\pi)+Hu(\pi)+\beta u(0)=0. \]