Nat Brandt makes no mention of Son's death in Auschwitz in "Con Brio"; this was first discovered and entered on Joods Community Monument and German Wikipedia in 2012; See entry for Henri Son at Joods Community Monument, su communityjoodsmonument.nl. which includes a copy of his Amsterdam police registration card.
"Recording & Discography - Budapest String Quartetto & its members...", compiled by Youngrok Lee Archived copy, su fischer.hosting.paran.com. URL consultato il 13 agosto 2010 (archiviato dall'url originale il 15 luglio 2011).