1. ADROIT, Applied Data Research, Route 206, Orchard Rd, CN-B, Princeton, NJ 08540.
2. The Author, Phoenix Performance Systems, Burroughs, Inc.
3. DIGI-DACT, Sofi, 906 rue Cherrier, Montréal, Québec H2L IH7.
4. DUO, DDTEC, 20 rue Condorcet, 75009, Paris, France.
5. NATAL, Conseil National de Recherches Canada, Ottawa.