You've found an article that is right on target for your project, but need more sources. There are a couple of easy ways to find additional sources.
That means the authors of 60 other papers have used del Moral's 1995 article in writing their papers. You can see the list of papers by clicking on the '60'.
Google Scholar can tell you how many times an article has been cited and by whom, and can link to the full-text of online articles if they fall within our subscriptions, and if Google Scholar knows you are with the University of Washington.
If you are using Google Scholar and don't see any "Full-Text @ UW" links, you can add UW as one of your libraries by doing the following:
Remember to use this button to check if an article is available online. You'll see this button in search results for BIOSIS and Web of Science.