BibTex format
@article{Broer:2011:10.1016/j.indag.2011.10.005,
author = {Broer, H and van, Strien S},
doi = {10.1016/j.indag.2011.10.005},
journal = {INDAGATIONES MATHEMATICAE-NEW SERIES},
pages = {135--135},
title = {Preface},
url = {http://dx.doi.org/10.1016/j.indag.2011.10.005},
volume = {22},
year = {2011}
}