Neittaanmaki, Pekka Optimization of elliptic systems : theory and applications / Pekka Neittaanmaki, Jürgen Sprekels, Dan Tiba - New York : Springer, 2006 - 507 p. : ill. ; 25 cm. ISBN: 0387272356 Subjects--Topical Terms: Differential equations, Elliptic--Numerical solutions