[1956] Every covering of a compact Riemann surface of genus greater than one carries a nontrivial$L$^{2}harmonic differential

[1957] New Banach space properties of the disc algebra and$H$^{∞}

[1958] Erratum to: Separatrices at singular points of planar vector fields

[1959] The arithmetic and geometry of some hyperbolic three manifolds

[1960] A geometric proof of Mostow's rigidity theorem for groups of divergence type