Citations refer to the original publication, not to a Scieee localized version.
Paun, G., Pazos, J., Pérez Jiménez, M. D. J., & Rodríguez Patón, A. (2005). Symport/Antiport P Systems with Three Objects Are Universal. IOS Press. https://idus.us.es/items/1a3ce5ec-63dc-4550-b423-3674a67e7e72
Paun, Gheorghe, et al. Symport/Antiport P Systems with Three Objects Are Universal. IOS Press, 2005. https://idus.us.es/items/1a3ce5ec-63dc-4550-b423-3674a67e7e72.
Paun, Gheorghe, Juan Pazos, Mario de Jesús Pérez Jiménez, and Alfonso Rodríguez Patón. Symport/Antiport P Systems with Three Objects Are Universal. IOS Press, 2005. https://idus.us.es/items/1a3ce5ec-63dc-4550-b423-3674a67e7e72.
Paun, G. et al. (2005) Symport/Antiport P Systems with Three Objects Are Universal. IOS Press. Available at: https://idus.us.es/items/1a3ce5ec-63dc-4550-b423-3674a67e7e72.
G. Paun, J. Pazos, M. D. J. Pérez Jiménez, and A. Rodríguez Patón, “Symport/Antiport P Systems with Three Objects Are Universal,” IOS Press, 2005. [Online]. Available: https://idus.us.es/items/1a3ce5ec-63dc-4550-b423-3674a67e7e72
@misc{paun2005symportantiport,
author = {Paun, Gheorghe and Pazos, Juan and Pérez Jiménez, Mario de Jesús and Rodríguez Patón, Alfonso},
title = {Symport/Antiport P Systems with Three Objects Are Universal},
year = {2005},
publisher = {IOS Press},
url = {https://idus.us.es/items/1a3ce5ec-63dc-4550-b423-3674a67e7e72}
}
The source metadata has no journal, volume or pages. Add them from the original publication if your citation needs them.