[1] Michel Marie Deza and Elena Deza. Encyclopedia of distances. Springer, 2009. doi:<a href="https://doi.org/10.1007/978-3-642-30958-8.10.1007/978-3-642-30958-8" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/978-3-642-30958-8.10.1007/978-3-642-30958-8</a>
[2] Anna Gomolińska. Rough approximation based on weak q-RIFs. In James F. Peters, Andrzej Skowron, Marcin Wolski, Mihir K. Chakraborty, and Wei-Zhi Wu, editors, Transactions on Rough Sets X, volume 5656 of Lecture Notes in Computer Science, pages 117–135, Berlin, Heidelberg, 2009. Springer. ISBN 978-3-642-03281-3. doi:<a href="https://doi.org/10.1007/978-3-642-03281-3_4.10.1007/978-3-642-03281-3_4" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/978-3-642-03281-3_4.10.1007/978-3-642-03281-3_4</a>
[3] Anna Gomolińska. On three closely related rough inclusion functions. In Marzena Kryszkiewicz, James F. Peters, Henryk Rybiński, and Andrzej Skowron, editors, Rough Sets and Intelligent Systems Paradigms, volume 4585 of Lecture Notes in Computer Science, pages 142–151, Berlin, Heidelberg, 2007. Springer. doi:<a href="https://doi.org/10.1007/978-3-540-73451-2_16.10.1007/978-3-540-73451-2_16" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/978-3-540-73451-2_16.10.1007/978-3-540-73451-2_16</a>
[4] Anna Gomolińska. On certain rough inclusion functions. In James F. Peters, Andrzej Skowron, and Henryk Rybiński, editors, Transactions on Rough Sets IX, volume 5390 of Lecture Notes in Computer Science, pages 35–55. Springer Berlin Heidelberg, 2008. doi:<a href="https://doi.org/10.1007/978-3-540-89876-4_3.10.1007/978-3-540-89876-4_3" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/978-3-540-89876-4_3.10.1007/978-3-540-89876-4_3</a>
[5] Adam Grabowski. On the computer-assisted reasoning about rough sets. In B. Dunin-K¸eplicz, A. Jankowski, A. Skowron, and M. Szczuka, editors, International Workshop on Monitoring, Security, and Rescue Techniques in Multiagent Systems Location, volume 28 of Advances in Soft Computing, pages 215–226, Berlin, Heidelberg, 2005. Springer-Verlag. doi:<a href="https://doi.org/10.1007/3-540-32370-8_15.10.1007/3-540-32370-8_15" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/3-540-32370-8_15.10.1007/3-540-32370-8_15</a>
[7] Adam Grabowski. Building a framework of rough inclusion functions by means of computerized proof assistant. In Tamás Mihálydeák, Fan Min, Guoyin Wang, Mohua Banerjee, Ivo Düntsch, Zbigniew Suraj, and Davide Ciucci, editors, Rough Sets, volume 11499 of Lecture Notes in Computer Science, pages 225–238, Cham, 2019. Springer International Publishing. ISBN 978-3-030-22815-6. doi:<a href="https://doi.org/10.1007/978-3-030-22815-6_18.10.1007/978-3-030-22815-6_18" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/978-3-030-22815-6_18.10.1007/978-3-030-22815-6_18</a>
[8] Adam Grabowski. Lattice theory for rough sets – a case study with Mizar. Fundamenta Informaticae, 147(2–3):223–240, 2016. doi:<a href="https://doi.org/10.3233/FI-2016-1406.10.3233/FI-2016-1406" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.3233/FI-2016-1406.10.3233/FI-2016-1406</a>
[12] Adam Grabowski and Christoph Schwarzweller. On duplication in mathematical repositories. In Serge Autexier, Jacques Calmet, David Delahaye, Patrick D. F. Ion, Laurence Rideau, Renaud Rioboo, and Alan P. Sexton, editors, Intelligent Computer Mathematics, 10th International Conference, AISC 2010, 17th Symposium, Calculemus 2010, and 9th International Conference, MKM 2010, Paris, France, July 5–10, 2010. Proceedings, volume 6167 of Lecture Notes in Computer Science, pages 300–314. Springer, 2010. doi:<a href="https://doi.org/10.1007/978-3-642-14128-7_26.10.1007/978-3-642-14128-7_26" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1007/978-3-642-14128-7_26.10.1007/978-3-642-14128-7_26</a>
[14] Jan Łukasiewicz. Die logischen Grundlagen der Wahrscheinlichkeitsrechnung. In L. Borkowski, editor, Jan Łukasiewicz – Selected Works, pages 16–63. North Holland, Polish Scientific Publ., Amsterdam London Warsaw, 1970. First published in Kraków, 1913.
[17] William Zhu. Generalized rough sets based on relations. Information Sciences, 177: 4997–5011, 2007.<a href="https://doi.org/10.1016/j.ins.2007.05.037" target="_blank" rel="noopener noreferrer" class="text-signal-blue hover:underline">10.1016/j.ins.2007.05.037</a>