Sunu, P. W., D. S. Anakottapary, I. M. Suarta, I. D. M. C. Santosa, and K. Suarsana. “HEAT TRANSFER ENHANCEMENT AND FRICTION IN DOUBLE PIPE HEAT EXCHANGER WITH VARIOUS NUMBER OF LONGITUDINAL GROOVES”. Acta Polytechnica, vol. 60, no. 6, Dec. 2020, pp. 518–527, doi:10.14311/AP.2020.60.0518.