@article{articled5725b20,
title   = {Exceptionally preserved jellyfishes from the middle Cambrian},
author = {Cartwright, Paulyn and Halgedahl, Susan L. and Hendricks, Jonathan R. and Jarrard, Richard D. and Marques, Antonio Carlos and Collins, Allen G and Lieberman, Bruce S.},
year = {2007},
journal   = {PLos ONE}
}