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It is well known that the universal covering of a complete Kahler manifold with constant bisectional curvature is \mathbb{C}^n, \mathbb{B}^n $\mathbb{C}^n$, $\mathbb{B}^n$ or \mathbb{CP}^n. $\mathbb{CP}^n$. I need original paper(s) that prove this theorem.
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Kahler manifolds with constant bisectional curvature

It is well known that the universal covering of a complete Kahler manifold with constant bisectional curvature is \mathbb{C}^n, \mathbb{B}^n or \mathbb{CP}^n. I need original paper(s) that prove this theorem.