Laka was asked to wite a book (Steps to a nuclear free-world) on several aspects of nuclear weapons and nuclear energy  (you can read it here)

During th walk, laka wrote several reports on the countries the walk was going through.
The status reports, as they were called, gave a could picture of the situation at that time (1995), but because they  have a lot of material on history and development of (mainly) nuclear energy they remain interesting to date.