Physical Review B - Condensed Matter and Materials Physics, 90-18, 2014 doi:10.1103/PhysRevB.90.180407
Günther Stefan, Spezzani Carlo, Ciprian Roberta, Grazioli Cesare, Ressel Barbara, Coreno Marcello, Poletto Luca, Miotti Paolo, Sacchi Maurizio, Panaccione Giancarlo, Uhlíř Vojtěch, Fullerton Eric E., De Ninno Giovanni, Back Christian H.