For additional information about Juda and Gerrit see the book Kopgeld, written by Ad van Liempt.
Addition of a visitor of the website
In addition, a Jokos file (number 34467) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 8277/3993).