Ludwig was in our group on many occasions:

• as Erasmus exchange student (from Wiesbaden University, Germany) in September-December 2007,
• as visiting student in May-June 2008,
• as Diploma project student in March-June 2009,
• as Intern student in July 2009,
• and finally, as a postgraduate research student in October 2009 – 30 June 2010.