Students who attend the summer school and want to collect two credit points are requested to return a written report to the summer school organizers. Send an email to atanas[dot]gotchev[at]tut[dot]fi) with pdf attachment of your report. The report should contain two parts. The first part should summarize all topics addressed at the school (one paragraph per topic). The second part should describe one of the topics in more details. The total length of the report should not exceed four pages. The report can be written either in Finnish or in English.