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This work was supported in part by the Polish Academy of Sciences.
The author would like to thank Prof. A. Pawlikowski for his interest in the present work and useful comments. The author is also indebted to Dr. E. Piotrowski for discussions and reading of the manuscript as well as to the referee his for remarks.
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Łuczka, J. Evolution equation for two level systems interacting with pump and relaxation mechanisms. Czech J Phys 34, 1150–1156 (1984). https://doi.org/10.1007/BF01590063
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DOI: https://doi.org/10.1007/BF01590063