how many papers to publish during phd

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The following individual variables are studied: gender, age and academic position.
We investigate the publication rate of Norwegian university researchers.

References:

http://www.sciencedirect.com/science/article/pii/S1751157715000218
http://neurologyandpaincareofparis.com/docs/9fvh543.php?8462dd=how-many-papers-to-publish-for-phd