To import SHIWA calendar to your own calendar use one of the following:

Calendar ID: 91ark0cq7g52l5v5245oi05590@group.calendar.google.com

 https://www.google.com/calendar/ical/91ark0cq7g52l5v5245oi05590%40group.calendar.google.com/public/basic.ics

 https://www.google.com/calendar/embed?src=91ark0cq7g52l5v5245oi05590%40group.calendar.google.com&ctz=Europe/Budapest

 https://www.google.com/calendar/feeds/91ark0cq7g52l5v5245oi05590%40group.calendar.google.com/public/basic

SHIWA (project number 261585) is supported by a Grant from the European Commission's  FP7 INFRASTRUCTURES-2010-2 call under grant agreement n°261585
Provided by the MTA SZTAKI Computer  and Automation Research Institute - Maintained by Laboratory of Parallel and Distributed Computing with Free and Open Source Software (2010)