Data base systems : proceedings, 5th Informatik Symposium, IBM Germany, Bad Homburg v.d.H., September 24-26, 1975 /

af Informatik Symposium, Hasselmeier, H., Spruth, W. G.
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Programming methodology : 4th Informatik Symposium, IBM Germany, Wildbad, September 25-27, 1974 /

af Informatik Symposium, Hackl, Clemens E., IBM Deutschland, IBM World Trade Corporation
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