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A. S. Dolgal
Mining Institute of the Ural Branch of RAS, 78A Sibirskaya Str., Perm 614007, Russia
Russian Federation
Dr.Phys.-Math. Sci., Lead Scientist of Laboratory of Geopotential Fields
R. N. Petrosyan
Antikarst and coastal protection LLC, 4a Danshchina Str., Perm Russia
Russian Federation
eng.
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