latex 插入url引用

在bib文件里按如下格式编辑url引用：

@misc{bworld,  author = {Ingo Lütkebohle},  title = {{BWorld Robot Control Software}},  howpublished = "\url{http://aiweb.techfak.uni-bielefeld.de/content/bworld-robot-control-software/}",  year = {2008},   note = "[Online; accessed 19-July-2008]"}