It's mentioned in the article > A PhD student by the name Sebastian Baltes publishes a paper in the journal of Empirical Software Engineering. The title is Usa

It's mentioned in the article > A PhD student by the name Sebastian Baltes publishes a paper in the journal of Empirical Software Engineering. The title is Usage and Attribution of Stack Overflow Code Snippets in GitHub Projects [...] As part of their analysis they extracted code snippets from the Stack Overflow data dump and matched them against code from public GitHub repos.