F. A. Meglhioratti, C. N. E.-H. El-Hani, and A. M. de A. Caldeira, “The concept of organism in a hierarchical and systemic approach to biology”, Rev. Biol., vol. 9, no. 2, pp. 7–11, Apr. 2018, doi: 10.7594/revbio.09.02.02.