1. G. T. Colwell , Prediction of Cryogenic Heat Pipe Performance , Rept. No. II, NASA Grant NSG-2054, February 1976 .
2. G. F. Smirnov , V. V. Barsookov , and L. N. Mishchenko , Engineering Methods of Low—Temperature Heat Pipe Designing Calculations , 2nd International Heat Pipe Conference , Bologna , Italy , March 31-April 2 , 1976 .