The users manual for the self-correlation 
          program Astrolab can be downloaded here. 
          Also, you may download a sample set of data 
          so that you can test the program. 
             If you have any further questions you 
          can contact John Percy at the University of Toronto. jpercy@utm.utoronto.ca 
          
        
         Further Reading 
        Another site that has a lot of information about specific variable 
          stars is The Astronomer magazine. 
               http://www.theastronomer.org/variables.html 
          
        To search through published papers by subject or by author, the Harvard 
          abstract service is very useful, although a membership is necessary 
          to view some papers.
               http://adsabs.harvard.edu/abstract_service.html 
          
        Here are a few examples of papers done using the techniques shown on 
          this page. These were written by John Percy with help from his students 
          who range from undergraduates to high school students participating 
          in a mentorship program: