Daniel G. Tracy has published "Format Shift: Information Behavior and User Experience in the Academic E-book Environment" in Reference & User Services Quarterly.
Here's an excerpt:
This article seeks to understand information behavior in the context of the academic e-book user experience, shaped by a disparate set of vendor platforms licensed by libraries. These platforms vary in design and affordances, yet studies of e-book use in an academic context often treat e-books as a unified phenomenon in opposition to print books. Based on participant diaries tracking e-book information behavior and follow-up interviews and focus groups on troubleshooting and format shifting behaviors, this study seeks to provide a deep qualitative look at decisions that academic users make about formats when encountering e-books.