1991 · AM Arjeh Cohen, G. C. M. Ruitenburg · Centrum Wiskunde & Informatica (CWI), the national research institute for mathematics and computer science in the Netherlands · 3
1980 · AM Arjeh Cohen · Centrum Wiskunde & Informatica (CWI), the national research institute for mathematics and computer science in the Netherlands · 2
1989 · AM Arjeh Cohen · Centrum Wiskunde & Informatica (CWI), the national research institute for mathematics and computer science in the Netherlands · 1
1980 · AM Arjeh Cohen · Centrum Wiskunde & Informatica (CWI), the national research institute for mathematics and computer science in the Netherlands · 1