@misc{popularpython,
    author = "Philip Guo",
    title = "Python Is Now the Most Popular Introductory Teaching Language at Top U.s. Universities",
    month = "July",
    year = "2014",
    howpublished = "\url{https://cacm.acm.org/blogs/blog-cacm/176450-python-is-now-the-most-popular-introductory-teaching-language-at-top-u-s-universities/fulltext}",
    note = "[Online; accessed 5-March-2018]"
}

@misc{pythongrowth,
    author = "David Robinson",
    title = "The Incredible Growth of Python",
    month = "September",
    year = "2017",
    howpublished = "\url{https://stackoverflow.blog/2017/09/06/incredible-growth-python/}",
    note = "[Online; accessed 6-March-2018]"
}

@misc{whypython,
    author = "David Robinson",
    title = "Why is Python Growing So Quickly?",
    month = "September",
    year = "2017",
    howpublished = "\url{https://stackoverflow.blog/2017/09/14/python-growing-quickly/}",
    note = "[Online; accessed 6-March-2018]"
}

@article{hansen2002open,
  title={The Open Source approach—opportunities and limitations with respect to security and privacy},
  author={Hansen, Marit and K{\"o}hntopp, Kristian and Pfitzmann, Andreas},
  journal={Computers \& Security},
  volume={21},
  number={5},
  pages={461--471},
  year={2002},
  publisher={Elsevier}
}

@article{maggiolo2012introducing,
  title={Introducing CMS: A Contest Management System.},
  author={Maggiolo, Stefano and Mascellani, Giovanni},
  journal={Olympiads in Informatics},
  volume={6},
  year={2012}
}

@article{maggiolo2014cms,
  title={CMS: a Growing Grading System.},
  author={MAGGIOLO, Stefano and MASCELLANI, Giovanni and WEHRSTEDT, Luca},
  journal={Olympiads in Informatics},
  volume={8},
  year={2014}
}

@article{leal2003mooshak,
  title={Mooshak: A Web-based multi-site programming contest system},
  author={Leal, Jos{\'e} Paulo and Silva, Fernando},
  journal={Software: Practice and Experience},
  volume={33},
  number={6},
  pages={567--581},
  year={2003},
  publisher={Wiley Online Library}
}

@inproceedings{leal2008using,
  title={Using Mooshak as a competitive learning tool},
  author={Leal, Jos{\'e} Paulo and Silva, Fernando},
  booktitle={The 2008 Competitive Learning Symposium, ACM-ICPC World Finals},
  year={2008}
}

@article{ribeiro2008early,
  title={Early introduction of competitive programming},
  author={Ribeiro, Pedro and Guerreiro, Pedro},
  journal={Olympiads in Informatics},
  volume={2},
  pages={149--162},
  year={2008}
}

@book{martin2009clean,
  title={Clean code: a handbook of agile software craftsmanship},
  author={Martin, Robert C},
  year={2009},
  publisher={Pearson Education}
}

@MastersThesis{Tsiamitros,
  author={Νικόλαος Τσιαμήτρος},
  title={Σχεδίαση και Υλοποίηση Καταναμημένου Συστήματος για την Αυτόματη
         Αξιολόγηση Προγραμματιστικών Ασκήσεων},
  school={Εθνικό Μετσόβιο Πολυτεχνείο},
  address={Ελλάδα},
  year={2015}
}

@MastersThesis{Rozhkov,
  author={Рожков М.},
  title={Система автоматического тестирования программ и организации соревнований по программированию},
  school={FEFU},
  address={Russia},
  year={2004},
}

@misc{deprecation,
    author={Adam Harvey},
    title={Request for Comments: ext/mysql deprecation},
    month={December},
    year={2012},
    howpublished={\url{https://wiki.php.net/rfc/mysql\_deprecation}},
    note={[Online; accessed 11-March-2018]}
}

@misc{mysqlapis,
    author = "PHP Contributors",
    title = "Choosing an API",
    howpublished = "\url{https://secure.php.net/manual/en/mysqlinfo.api.choosing.php}",
    note = "[Online; accessed 6-March-2018]"
}

@misc{pdo,
    author = "PHP Contributors",
    title = "PHP Data Objects",
    note = "\url{https://secure.php.net/manual/en/book.pdo.php}",
    howpublished = "[Online; accessed 7-March-2018]"
}

@misc{dsn,
    author = "Wikipedia contributors",
    title = "Data source name --- Wikipedia{,} The Free Encyclopedia",
    year = "2017",
    howpublished = "\url{https://en.wikipedia.org/w/index.php?title=Data_source_name&oldid=796073781}",
    note = "[Online; accessed 17-March-2018]"
}