TY - BOOK AU - Gazzola Filippo AU - Grunau Hans-Christoph AU - Sweers Guido TI - Polyharmonic boundary value problems: positivity preserving and nonlinear higher order elliptic equations in bounded domains SN - 978-3-642-12244-6 U1 - 515.35 PY - 2010/// CY - Berlin PB - Springer-Verlag KW - Boundary value problems ER -