@misc{ref1,
author = {AuthorA},
title = {Title of a web resource},
howpublished = {\url{http://url/of/resource/}},
year = {2007}
}
@article{ref2,
author = {AuthorC},
journal = {Journal name},
pages = {13--17},
title = {Title of an article},
volume = {6},
year = {2008}
}
@inproceedings{ref3,
author = {AuthorC},
booktitle = {useR! 2008, The R User Conference (Dortmund, Germany)},
pages = {31--37},
title = {{Article example in proceedings}},
year = {2008}
}