Results of pilot operation of the IUM-1 sea level meter 01.06.202004.02.2005 by Светлана Малахатко N. A. Grekov, V. I. Zaburdaev, P. V. Gaisky, A. N. Logvinchuk, A. P. Alekseev, V. A. Naumova Full text in PDF(R8S)