BibTex format
@article{Christensen:1992,
author = {Christensen, K and Olami, Z},
journal = {Journal of Geophysical Research},
pages = {8729--8735},
title = {Variation of the Gutenberg-Richter b values and nontrivial temporal correlations in a spring-block model for earthquakes},
volume = {97},
year = {1992}
}