Erdoğan, E., Ferrer-Sapena, A., Jiménez-Fernández, E., & Sánchez-Pérez, E. A. . (2022). Index spaces and standard indices in metric modelling. Nonlinear Analysis: Modelling and Control, 27(4), 803-822. https://doi.org/10.15388/namc.2022.27.27493