@inproceedings{Durand2011, 
     address = "Dagstuhl, Germany", 
     author = "Durand, Arnaud and Strozecki, Yann", 
     booktitle = "CSL 2011: the 25th International Workshop/20th Annual Conference of the EACSL - Computer Science Logic", 
     doi = "10.4230/LIPIcs.CSL.2011.189", 
     editor = "Bezem, Marc", 
     isbn = "978-3-939897-32-3", 
     issn = "1868-8969", 
     keyword = "004,descriptive complexity,enumeration,query problem", 
     language = "eng", 
     link = "http://drops.dagstuhl.de/opus/volltexte/2011/3231/", 
     month = "aug", 
     pages = "189--202", 
     publisher = "Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik", 
     series = "Leibniz International Proceedings in Informatics (LIPIcs)", 
     title = "Enumeration Complexity of Logical Query Problems with Second-order Variables", 
     uri = "http://drops.dagstuhl.de/opus/volltexte/2011/3231/", 
     volume = "12", 
     year = "2011", 
}

Problems: 206