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Robert Marnelius, “A simple relation between covariant and noncovariant quantization of gauge theories”, Physics Letters B, 99:6 (1981), 467
Arne Kihlberg, Robert Marnelius, N. Mukunda, “Relativistic potential models as systems with constraints and their interpretation”, Phys. Rev. D, 23:10 (1981), 2201
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David E. Miller, Frithjof Karsch, “Covariant structure of relativistic gases in equilibrium”, Phys. Rev. D, 24:10 (1981), 2564
D.R. Bès, O. Civitarese, H.M. Sofía, “Perturbative treatment of nuclear rotations”, Nuclear Physics A, 370:1 (1981), 99
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