Superstars International Series 2013
according to the italian magazine Autosprint this is the 2013 calendar
April 7 - Monza
May 19 - Brno
June 9 - Slovakia Ring
June 23 - Zolder
July 21 - Portimao
September 1 - Donington
September 29 - Imola
October 13 - TBA (a round in Italy or Spain)
extra european round TBC
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