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Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 7, pp. 3–4, July, 1991.
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Kurbanov, M.K., Kuliev, R.M., Guseinova, Z.G. et al. Small Christmas tree and tubing head. Chem Petrol Eng 27, 365–366 (1991). https://doi.org/10.1007/BF01262662
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DOI: https://doi.org/10.1007/BF01262662