STD- sea level meter IUM-1 25.03.202011.10.2003 by Сергей Бейцер V. A. Gaisky, N. A. Grekov, P. V. Gaisky, A.V. Klimenko, A. N. Logvinchuk,V. Zh.Mishurov, M. N. Penkov, V. A. Trofimenko. (reviewed by V. Z. Dykman). Full text in PDF(RUS)