bibtex-search 
Command-line interface for retrieving BibTeX references
Currently uses ACM's Digital Library, Google Scholar and IEEE Xplore to find papers, but might support other sources in the future.
Installation
bibtex-search needs at least version 7.6 of Node.js installed.
$ npm install --global bibtex-searchUsage
$ bibtex-search <query>
Options:
--source, -s Where to find papers from (default: acm) - valid options: [acm, ieee, google]
Examples:
$ bibtex-search bayou
$ bibtex-search --source google zaharia spark