The published papers can't be found for several reasons. 1. The paper you published is not a journal of hydropower economy, so you can't find it in the journal of hydropower economy. 2. Maybe your paper has signed a confidentiality agreement with journals and magazines, so it won't be published online. 3. It takes time to publish the included papers, but it can't be found. It may not be published yet, so sit and wait for a while. 4. The quality of the article is not high, so it can't be retrieved. High quality papers will be retrieved.