Citations refer to the original publication, not to a Scieee localized version.
Nunes Gomes Tomás, A. P. (2013). Guarding the vertices of thin orthogonal polygons is NP-hard. https://idus.us.es/items/cffeef3a-cc6f-4e0f-98bb-49f4b64f15ee
Nunes Gomes Tomás, Ana Paula. Guarding the vertices of thin orthogonal polygons is NP-hard. 2013. https://idus.us.es/items/cffeef3a-cc6f-4e0f-98bb-49f4b64f15ee.
Nunes Gomes Tomás, Ana Paula. Guarding the vertices of thin orthogonal polygons is NP-hard. 2013. https://idus.us.es/items/cffeef3a-cc6f-4e0f-98bb-49f4b64f15ee.
Nunes Gomes Tomás, A. P. (2013) Guarding the vertices of thin orthogonal polygons is NP-hard. Available at: https://idus.us.es/items/cffeef3a-cc6f-4e0f-98bb-49f4b64f15ee.
A. P. Nunes Gomes Tomás, “Guarding the vertices of thin orthogonal polygons is NP-hard,” 2013. [Online]. Available: https://idus.us.es/items/cffeef3a-cc6f-4e0f-98bb-49f4b64f15ee
@misc{nunesgomestomas2013guarding,
author = {Nunes Gomes Tomás, Ana Paula},
title = {Guarding the vertices of thin orthogonal polygons is NP-hard},
year = {2013},
url = {https://idus.us.es/items/cffeef3a-cc6f-4e0f-98bb-49f4b64f15ee}
}
The source metadata has no journal, volume or pages. Add them from the original publication if your citation needs them.