Carleman estimates and applications to inverse problems
Isakov, V. (2004). "Carleman Estimates and Applications to Inverse Problems." Milan Journal of Mathematics 72(1): 249-271.
This review paper describes some general and recent results of possible interest for mathematicians studying or using uniqueness of the continuation or working on control theory or inverse problems for partial diﬀerential equations. We restrict the exposition to equations of second order or some important systems of such equations.