This research was done while the second and the third authors were guest professors at the Mathematics Institute of the University of Heidelberg.
Supported in part by National Science Foundation Grant CCR-8814339, National Security Agency Grant MDA904-87-H, and a Fulbright-Hays Research Fellowship.
Supported in part by National Science Foundation Grants DMS-8807389 and INT-8722296 and a grant of the Deutsche Forschungsgemeinschaft.
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Ambos-Spies, K., Homer, S., Soare, R.I. (1990). Minimal pairs and complete problems. In: Choffrut, C., Lengauer, T. (eds) STACS 90. STACS 1990. Lecture Notes in Computer Science, vol 415. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-52282-4_29
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