ion ▁Krak au . ▁Both ▁were ▁transport ed ▁to ▁the ▁Sachsen hausen ▁concentration ▁camp , ▁where ▁his ▁brother ▁died ▁on ▁ 2 8 ▁December ▁ 1 9 3 9 . ▁T ade usz ▁surv ived ▁the ▁camp ▁and ▁was ▁released ▁in ▁February ▁ 1 9 4 0 , ▁following ▁protest s ▁from ▁European ▁academ ics ▁to ▁the ▁Naz i ▁German ▁government . ▁ ▁See ▁also ▁List ▁of ▁Pol es ▁ ▁References ▁Notes ▁ ▁S ources ▁Ban ach , ▁A . K ., ▁Dy bie c , ▁J . ▁& ▁Stop ka , ▁K . ▁The ▁History ▁of ▁the ▁J agi ell onian ▁University . ▁Krak ów : ▁J agi ell onian ▁University ▁Press , ▁ 2 0 0 0 . ▁B ure k , ▁Edward ▁( ed .) ▁“ Est reich er , ▁T ade usz ” ▁in ▁En cyk lopedia ▁Krak owa . ▁Krak ów : ▁P WM , ▁ 2 0 0 0 . ▁Julian ▁K ame cki , ▁„ Pro f . ▁dr ▁T ade usz ▁Est reich er ▁( 1 8 7 1 - 1 9 5 2 ): ▁U cz ony ▁i ▁czł owie k “, ▁Roc zn iki ▁chem ii : ▁Ann ales ▁Soci et atis ▁Ch im ica e ▁Pol on orum , ▁vol . 2 6 , ▁no . 4 , ▁ 1 9 5 2 , ▁pp . 5 0 5 - 5 1 9 . ▁ ▁External ▁links ▁▁ ▁The ▁Fac ulty ▁of ▁Chem istry ▁at ▁the ▁J agi ell onian ▁University ▁