Often it is possible to find articles en references (some in bibtex) using a standard search engine. In Alta Vista for example, try entering the full title of an article you are looking for, enclosed by double quotes. Note: punctuations are apparently ignored, but capitals aren't, even though the results report suggests otherwise. When 1 or more capitals are present in your search term, the whole term is treated as case-sensitive. You can also try my home-made search script getwebref.pl. The thing is a little outdated and needs to be adapted to the new Alta Vista style.
A very small Web server + search engine
It is quite easy to write a Web server, if you don't care about performance. Here is an example of a Web server that serves as a front end to Alta Vista, displaying all hits on a single page: guppiesearch3.pl.
A very small Web client
A very simple Web client that is already useful is a command for fetching a URL and outputting the results to stdout: htget.pl. This script may be used to automatically fetch URLs inside shell scripts, or even write a simple Web browser!