Journal of Physics Condensed Matter, 27-16, 2015 doi:10.1088/0953-8984/27/16/164206
Ulstrup Søren, Johannsen Jens Christian, Crepaldi Alberto, Cilento Federico, Zacchigna Michele, Cacho Cephise, Chapman Richard T., Springate Emma, Fromm Felix, Raidel Christian, Seyller Thomas, Parmigiani Fulvio, Grioni Marco, Hofmann Philip