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11 “... at the Universitat Kaiserslautern in Kaiserslautern, Germany, from August 13 to August 24, 1979. Twenty invited...”

12 “... Informatics research group at Technische Universität Clausthal, Germany, and Lucas Pereira, research fellow...”

13 “... at Goethe Universität Frankfurt. He has a diploma in physics and a PhD in astronomy, both from...”

14 “..., the University of Toronto, Technische Universität Berlin, Texas A&M, the University of Pennsylvania, and many...”

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16 “..., Universitas Sumatera Utara, collaborated with the center of
excellence and innovation (Pusat Unggulan...”