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\bibitem{Mushtaq_etal2021} {\textquotedblleft}\textit{Third-Order Nonlinear Optical Properties and Saturation of Two-Photon Absorption in Lead-Free Double Perovskite Nanocrystals under Femtosecond Excitation}{\textquotedblright}. Mushtaq A, Pradhan B, Kushavah D, Zhang Y, Wolf M, Schrenker N, Fron E, Bals S, Hofkens J, Debroye E, Pal SK, Acs Photonics \textbf{8}, 3365 (2021).   http://doi.org/10.1021/acsphotonics.1c01351

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