For citations:
Sapunov V.A., Denisov A.Y., Saveliev D.V., Soloviev A.A., Khomutov S.Y., Borodin P.B., Narkhov E.D., Sergeev A.V., Shirokov A.N. New vector/scalar Overhauser DNP magnetometers POS-4 for magnetic observatories and directional oil drilling support. Magnetic Resonance in Solids. 2016;18(2):16209 (9 pp.).