[NTG-context] how to cite URLs in BibTeX bibliographies

hi,all In latex, the following bib item: @misc{bloom, title = {Bloom programming language}, howpublished = {\url{http://www.bloom-lang.org}}, key = {Bloom} } will compile it into the following bibliographies in pdf: [9] Bloom programming language. http://www.bloom-lang.org. But in context, the bib item can not be successfully compiled , what should I do to cite this? Thanks! BEST REGARDS PengCZ