Gunnar Färber

Witzkeite: A new rare nitrate-sulphate mineral from a guano deposit at Punta de Lobos, Chile

N. Chukanov, F. Cámara, D. Atencio, 2012 .

Antipinite, KNa3Cu2(C2O4)4, a new mineral species from a guano deposit at Pabellón de Pica, Chile

K. Lyssenko, N. Chukanov, S. Aksenov, 2015, Mineralogical Magazine.