25 citations · 97 across the 23 of their papers we have counts for
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W. Arendt, A. F. M. ter Elst
Consider the Dirichlet problem with respect to an elliptic operator \[ A = - \sum_{k,l=1}^d \partial_k \, a_{kl} \, \partial_l - \sum_{k=1}^d \partial_k \, b_k + \sum_{k=1}^d c_k \…