I'm studying a little of Complex Analysis and I have seen that I can use the integrals of complex functions as integrals of differential forms in $\mathbb{R}^n.$ For example: Cauchy Theorem for complex analytic functions is a consequence of the fact that a closed differential form on a simply connected set is exact.
My question is : Are there other famous theorem of Complex Analysis that I can prove with the theory of differential forms in Euclidean space?
One such book is H. Cartan, Elementary theory of analytic functions of one or several complex variables, Paris, Herman, 1963.