The metallicity extremes of the Sagittarius dSph: SALT spectroscopy of PNe

Alexei Y. Kniazev, Albert A. Zijlstra, Eva K. Grebel, Leonid S. Pilyugin, Simon Pustilnik, Petri Väisänen, David Buckley, Yas Hashimoto, Nicola Loaring, Encarni Romero, Martin Still, Eric B. Burgh, Kenneth Nordsieck