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Pat. 10578754 United States, Int. Cl.22 G01V 1/00, E21B 49/00, G01V 1/04, G01V 1/40, G01V 1/44, H02M 7/538, H03F 3/26, H03F 3/45. Sinusoidal excitation method and apparatus for multi-pole acoustic logging while drilling : Appl. N 16/193855 : Filed 16.11.2018 : Pub. 03.03.2020 : / Yuntao Sun, Zili Wang, Wenxuan Chen, Wenxiu Zhang, Yongyou Yang, Qingyun Di, Jian Zheng ; Assignee Institute of Geology and Geophysics of Cas ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10578754/en?oq=US10578754.html (дата обращения: ДД.ММ.ГГГГ).