Upconversion nanoparticles with anti-Stokes luminescence as bioimaging agentsPolina A. Demina, Evgeniy V. Khaydukov, Natalia V. Sholina, Vasilina V. Rocheva, Dmitry A. Khochenkov, Roman A. Akasov and Alla N. GeneralovaEPJ Web Conf., 190 (2018) 04005DOI: https://doi.org/10.1051/epjconf/201819004005