[Oberon] 30th anniversary of Oberon

[Treutwein Bernhard]

> Usually it's the date of an official publication, such as the 1988 language report which was published in 
> Wiley Software: Practice & Experience. Also an official techical report of a university or similar documents 
> are official publications. I don't think the date when the document was written or an idea was stabilized is 
> the relevant date.

The earliest publication, meeting one of these criteria I found, is the following:
	https://www.research-collection.ethz.ch/handle/20.500.11850/68917 or the full text
	https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/68917/eth-3189-01.pdf 

--
  Bernhard