BibTex format
@article{Isham:2002:10.1063/1.1507605,
author = {Isham, CJ and Savvidou, K},
doi = {10.1063/1.1507605},
journal = {JOURNAL OF MATHEMATICAL PHYSICS},
pages = {5493--5513},
title = {The foliation operator in history quantum field theory},
url = {http://dx.doi.org/10.1063/1.1507605},
volume = {43},
year = {2002}
}