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Well construction and drilling technology for thermal water..:

Damdin Surmaajav ; Andrey G. Vakhromeev ; Georgiy M. Tolkachev...
http://vestnik.pstu.ru/get/_res/fs/file2.pdf/9103/Well+construction+and+drilling+technology+for+thermal+water+production+in+challenging+geological+conditionsfile2.pdf.  , 2019