We've come to rely on Google too much, so much that if you are not on Google you don't exist. That's a problem with researchers that are looking for articles to cite.

- it was previously available on Google Scholar

- it cannot be retrieved, or the search on Google Scholar gives a misleading result (for example it gives another article, as explained in [1])

Please help to make a list of scholar dropouts! Thank you.

[1] https://news.ycombinator.com/item?id=19604722 HN comment with evidence

[2] https://news.ycombinator.com/item?id=19604955 HN reply with another evidence

Fingers crossed they don't get dropped from the main index too.