As an author, I have published in quite a variety of journals in my time. Earlier in my career, I was an editorial staff member at a learned-society publisher. In neither case have I ever been aware of any pressure on authors to cite references in the same journal. As a referee, I have never suggested adding extra references for this reason, though I have for other reasons.
This is all anecdotal, but I feel that this may be a non-problem. I might be over-optimistic - maybe I have only ever had connections with the more scrupulous end of the journals market. Fytton Rowland, Loughborough University, UK.
