@article{article933749fc,
title   = {Valences of dopants in Eu POT. 2+' persistent luminescence materials},
author = {Lastusaari, Mika and Brito, Hermi Felinto de and Carlson, S and Hölsa, Jorma and Laamanen, Taneli and Rodrigues, Lucas Carvalho Veloso and Welter, Eduardo},
year = {2014},
doi = {10.1088/0031-8949/89/04/044004},
journal   = {Physica Scripta}
}