In the '70s Oberski joined a poetry workshop, after which it occurred to him to write about his own experiences of the concentration camps. In 1978 the book Kinderjaren (Childhood) was first published in The Netherlands. The book, in particular, follows the events through the eyes of a small child.

Translations of Childhood have been published in Canada, Denmark, Germany, United Kingdom, Finland, Greece, Hungary, Indonesia, Israel, Italy, Japan,Croatia, Norway, Poland, Spain, USA, Sweden.Childhood was filmed as "Jonah who lived in the whale", put unto DVD as "Look to the sky".

He further published two more literary works in Dutch, De ongenode gast (1995) (The Uninvited Visitor) and De eigenaar van niemandsland (1997) (The Proprietor of No Mans Land), and columns and articles for several magazines. Other published works are related to his science specialty, physics, like his: "An alpha-deuteron correlation experiment on carbon with the multidetector BOL (Ph.D. thesis) (1971)"