Soft Labelling for Deep Ordinal Classification: An Experimental Review - Vargas, V.M.; Guijo-Rubio, D.; Ayllon-Gavilan, R.; Gomez-Orellana, A.M.; Gutierrez, P.A.; Hervas-Martinez, C. (IEEE Transactions on Knowledge and Data Engineering, Knowledge and Data Engineering, IEEE Transactions on, IEEE Trans. Knowl. Data Eng., 2026)