The Boundary Behaviour of Derivatives of Univalent Functions. A.J. Lohwater — 1971 Mathematische Zeitschrift
Linear Accessibility of Boundary Points of a Jordan Region. G. Piranian; A.J. Lohwater — 1951 Commentarii mathematici Helvetici
The derivative of a Schlichtfunction G. PIRANIAN; A.J. LOHWATER; W. RUDIN — 1955 Mathematica Scandinavica