3 citations to https://www.mathnet.ru/rus/znsl201
  1. Lucas Chesnel, “Bilaplacian problems with a sign‐changing coefficient”, Math Methods in App Sciences, 39:17 (2016), 4964  crossref
  2. Gazzola F., Grunau H.-Ch., Sweers G., Polyharmonic boundary value problems, Positivity preserving and nonlinear higher order elliptic equations in bounded domains, Lecture Notes in Math., 1991, Springer-Verlag, Berlin, 2010, xviii+423 pp.  crossref  mathscinet  zmath  isi  scopus
  3. Sweers G., “A survey on boundary conditions for the biharmonic”, Complex Var. Elliptic Equ., 54:2 (2009), 79–93  crossref  mathscinet  zmath  isi  elib  scopus