BibTex format
@article{HALLIWELL:1990:10.1103/PhysRevD.41.1815,
author = {HALLIWELL, JJ and HARTLE, JB},
doi = {10.1103/PhysRevD.41.1815},
journal = {PHYSICAL REVIEW D},
pages = {1815--1834},
title = {INTEGRATION CONTOURS FOR THE NO-BOUNDARY WAVE-FUNCTION OF THE UNIVERSE},
url = {http://dx.doi.org/10.1103/PhysRevD.41.1815},
volume = {41},
year = {1990}
}