@article{zakihindi2026reference,
  author = {Zaki-Hindi, Ayat and Soto, Paola and Castellanos, German and Pritom, Touhid Hossain and Volpe, Gaetano and Zellagui, Iskander and Hensel, Burkhard and Jimenez, Julian and Marvulli, Michele and Santos, Lu{\'{i}}s and Sayin, Ayse and Sottet, Jean-S{\'{e}}bastien and Ali, Wasim and El-Korbi, Ines and Turcanu, Ion and Belogaev, Andrey and Duarte, Andr{\'{e}} and Kelly, Ultan and Kumar, Sumit and Myagkov, Georgy and Parker, Stephen and Franke, Mario and Hossain, Shajjad and Sanyal, Rajarshi and Shafi, Nida and Sommer, Christoph and Camelo Botero, Miguel and Baudouin, Julien and Decorme, R{\'{e}}gis and Fanti, Maria Pia and Fuladi, Ramin and Murphy, Chris and Pereira, Ana and Senouci, Sidi Mohammed and Pryor, Simon and Faye, Sebasti{\'{e}}n},
  title = {{A Reference Functional Architecture for Network Digital Twins in 6G Systems}},
  journal = {IEEE Open Journal of the Communications Society},
  doi = {10.1109/OJCOMS.2026.3668035},
  issn = {2644-125X},
  month = {February},
  pages = {2068--2101},
  publisher = {IEEE},
  volume = {7},
  year = {2026},
}