@article{article, title  = {{Search engine coverage bias: evidence and possible causes}},

 publisher = {{Elsevier BV}},

 url = {{http://dx.doi.org/10.1016/s0306-4573(03)00063-3 }},

 year = {{2004}},

 month = {{7}},

 author = {{Vaughan L and Thelwall M}},

 doi = {{10.1016/s0306-4573(03)00063-3}},

 volume = {{40}},

 journal = {{Information Processing & Management}},

 issue = {{4}},

 pages = {{693-707}},

 note = {{Accessed on 2024/09/19}}}