Martinez Maestro, L, Pedroni, M, PIccinelli, F, Passuello, T, Polizzi, S, Ueda, J, Haro-Gonzalez, H, Jaque, D, Garcia-Sole, J, Bettinelli, M, Speghini, A, "Water (H2O and D2O) dispersible NIR-to-NIR upconverting Yb3+/Tm3+ Doped MF2 (M = Ca, Sr) Colloids : influence of the host crystal", Crystal Growth and Design, 2013