Mukhuti, Kingshuk Classification of Transitions in Upconversion Luminescence of Lanthanides by Two-Dimensional Correlation Analysis. [electronic resource] - The journal of physical chemistry. A Mar 2019 - 2457-2461 p. digital Publication Type: Journal Article ISSN: 1520-5215 Standard No.: 10.1021/acs.jpca.8b11052 doi