The M. W. Kellog Company. Design of Piping System. 1965, 52
KARMAN, T. Ueder die Formanderung Dunnwandiger Rohre, Insbesondere Federnder Ausgleichrohre. Zeitschcrift des Vereinos Deutscher Ingenieure. 1911, 55, 45, 1889-1895
MARKL, A. Fatigue Tests of Piping Components. Transactions of the ASME. 1952, 74, 287-303
RODABOUGH, E. Effect of Internal Pressure on Flexibility and Stress-Intensification Factors of Curved Pipe or Welding Elbows. Transactions of the ASME. 1957, 939-948