Increasing the efficiency of heating systems through the use of direct contact heat exchange by Ivanov I.A., Persiyanova G.E.

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Changes in the structure and geography of tourist flows during the COVID-19 pandemic by Manakov A. G., Krastev V. K., Krasilnikova I. N., Ivanov I. A.

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Shell-type SNRs as sources of cosmic rays by Sinitsyna V.G., Andreeva M.S., Balygin K.A., Borisov S.S., Ivanov I.A., Kirichenko A.M., Klimov A.I., Kozhukhova I.P., Mirzafatikhov R.M., Moseiko N.I., Ostashev I.E., Palamarchuk A.I., Sinitsyna V.Y., Volokh I.G.

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Very high energy emission sources beyond the Galaxy by Sinitsyna V.G., Andreeva M.S., Balygin K.A., Borisov S.S., Ivanov I.A., Kirichenko A.M., Klimov A.I., Kozhukhova I.P., Mirzafatikho R.M., Moseiko N.I., Ostashev I.E., Palamarchuk A.I., Sinitsyna V.Y., Volokh I.G.

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