Macfarlane, Ian P. 2022. “PILGRIMS PROGRESS - LEARNING TO USE THE NUMERICAL ELECTROMAGNETICS CODE (NEC) TO CALCULATE MAGNETIC FIELD STRENGTH CLOSE TO A SOMMERFELD GROUND”. Applied Computational Electromagnetics Society Journal (ACES) 5 (2):58-75. https://journals.riverpublishers.com/index.php/ACES/article/view/17801.