that is, the determinate [could ''[[determinant]]'' have been meant here?] of the transformation.<ref name=lovelock>{{cite book| last=Lovelock| first=David| title=Tensors, Differential Forms, and Variational Principles|year=April 1, 1989 | publisher=Dover | isbn=0486658406 | pages=400 | url=http://store.doverpublications.com/0486658406.html | coauthors=Rund | accessdate=19 April 2011 | page=103 | format=Paperback | chapter=4}}</ref>
