Reference Miner 4.2.5 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application's installer is commonly called bookends.dmg.zip.
The actual developer of this Mac application is Sonny Software, LLC. The following versions: 4.1, 4.0 and 3.1 are the most frequently downloaded ones by the program users. The software lies within Productivity Tools, more precisely Office Tools. This application can be installed on Mac OS X 10.6.6 or later. We recommend checking the downloaded files with any free antivirus.
From the developer:
Reference Miner searches the following Internet sites to find and display reference information: PubMed, the Library of Congress, "Google Scholar", JSTOR (requires access privileges and ip authentication), and Amazon (US, UK, Germany, Japan, France, and Canada).
You may want to check out more Mac applications, such as RPC Miner, Min or Zcash Miner, which might be similar to Reference Miner.
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