Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
V A Klyachin,Zero mean curvature surfaces of mixed type in Minkowski space,Izvestiya: Mathematics,1064-5632,Steklov Mathematical Institute,2003-04-30,67,2,209-224,https://cir.nii.ac.jp/crid/1363107369696984576,https://doi.org/10.1070/im2003v067n02abeh000425