Fair point. So far I haven't found the underlying papers (Google isn't great at turning up papers I know I've read about in books, it turns out..) however the Internet's non-scholarly literature on the subject consistency identifies procrastination as essentially an anxiety disorder, not one of poor time management skills. e.g. :
One of the leading researchers in this field is Tim Pychyl. I learned most about the subject by reading his books and listening to all his podcast interviews with fellow researchers. It is possible the papers I'm thinking of are listed on his group's web site. The paper titles tend to be hard to parse, unfortunately:
