I am currently doing a (blind) review of a paper for a Journal in the engineering field. The manuscript seems okay so far but relies to a large extent on a unpublished paper, cited as Miller et al. forthcoming. That publication was not submitted along with the manuscript. The author seems to be involved in that publication, but is not co-authoring it. Since no journal or publisher is given, I am assuming that the manuscript is under preparation and to be submitted to a Journal.
Furthermore, there is no summary of the central data and results e. g. in the supporting information. That makes it hard to follow some of the assumptions and conclusions.
- How should I proceed?
- And does this in principle justify a rejection of the paper?