I would like to find good references for the theorems mentioned above in the title.  I am reading chapter VIII of Hörmander's classic, but I wonder whether there is something more up-to-date.

My motivations are the uniqueness results in Calderon problem for partial data and the linearized problem. These results were first derived by Dos Santos, Kenig, Sjöstrand and Uhlmann, and in the end they end up having to study the injectivity of a certain limited-angle Radon transform. To this end, they need the mentioned theorems.

Thanks.