@article{Sliusar:2021CG, author = "Sliusar, Vitalii and Arbet-Engels, Axel and Baack, Dominik and Balbo, Matteo and Biland, Adrian and Bretz, Thomas and Buss, Jens and Dorner, Daniela and Eisenberger, Laura and Elsaesser, Dominik and Hildebrand, Dorothee and Iotov, Roman and Kalenski, Adelina and Mannheim, Karl and Mitchell, Alison and Neise, Dominik and Noethe, Maximilian and Paravac, Aleksander and Rhode, Wolfgang and Schleicher, Bernd and Walter, Roland", title = "{Relentless multi-wavelength variability of Markarian 421 and Markarian 501}", doi = "10.22323/1.395.0808", journal = "PoS", year = 2021, volume = "ICRC2021", pages = "808" }