%0 Journal Article
%T There was a time
%A van der Merwe
%A Nielen
%J Journal of Power and Energy Engineering 电力与能源
%D 2019
%U http://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S2225-62532019000800012&lng=en&nrm=iso&tlng=en