147 citations · 733 across the 37 of their papers we have counts for
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math-ph2013★ 62 cited
Green-hyperbolic operators on globally hyperbolic spacetimes
Christian Baer
Green-hyperbolic operators are linear differential operators acting on sections of a vector bundle over a Lorentzian manifold which possess advanced and retarded Green's operators.…
math.DG2013★ 36 cited
Guide to Boundary Value Problems for Dirac-Type Operators
Christian Baer, Werner Ballmann
We present an introduction to boundary value problems for Dirac-type operators on complete Riemannian manifolds with compact boundary. We introduce a very general class of boundary…