You can also add this calendar to your own calendar using this URL in iCal format:
https://calendar.google.com/calendar/ical/limlpaquvh710j065b51nfrt8o%40group.calendar.google.com/public/basic.ics
Or add this calendar to your own webpage using this URL:
https://calendar.google.com/calendar/embed?src=limlpaquvh710j065b51nfrt8o%40group.calendar.google.com&ctz=Europe%2FBerlin