Access

Open Access

Date Range

July 1990 - August 1991

Description

This paper was first prepared for a conference at Castle Szirak, Hungary, Aug. 30-31, 1990. It was edited and retyped a number of times. Given here is the final draft prepared in August 1991 apparently. The original paper is the first alternate version given. The intermediate re-edits are given following that.

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