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Translated from Matematicheskie Zametki, Vol. 41, No. 5, pp. 724–730, May, 1987.
The author expresses thanks to V. A. Iskovskikh for posing the problem and great interest in the work.
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Alekseev, V.A. Rationality conditions for three-dimensional varieties with sheaf of Del Pezzo surfaces of degree 4. Mathematical Notes of the Academy of Sciences of the USSR 41, 408–411 (1987). https://doi.org/10.1007/BF01159867
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DOI: https://doi.org/10.1007/BF01159867