Letter It is a Christmas letter. The authors, Bjorner's family, describe the outgoing year: all is fine, they are all healthy. They had many interesting trips in the different countries. They remember also sad events of the year: the death of the close friends. Date: 28.12.1987 Original document language: English Authors: Dines Bjorner Persons: Aad van Wijngaarden Addressee: Andrei Petrovich Ershov
