David Benn's excellent paper on VStar has been published in the Journal of the AAVSO, Volume 40, Number 2. This paper was posted as an eJAAVSO file earlier this year (find it at http://www.aavso.org/jaavso-v40n2  and look down the list for page 852).
The full issue of the Journal has now been published and is available free to members as a pdf document. Printed copies will be available for purchase in about a week. For either version, please go http://www.aavso.org/jaavso-v40n2 
Thank you, again, David, for your countless hours of dedicated volunteering to make VStar the tremendous resource that it is!
Good data plotting and analyzing to all,
Elizabeth Waagen, AAVSO HQ