M. Gugat, M. Herty, A. Klar, G. Leugering, and V. Schleper. Constrained optimization and optimal control for partial differential equations, volume 160 of International series of numerical mathematics, page 123-146. Birkhäuser, (2012)
B. Haasdonk. Albert-Ludwigs-Universität, Freiburg im Breisgau, Fakultät für Angewandte Wissenschaften, (Mai 2005)Published 2006 as ISBN-3-8322-5026-3, Shaker-Verlag, Aachen, and Online at http://www.freidok.uni-freiburg.de/volltexte/2376.
F. Albrecht, B. Haasdonk, S. Kaulmann, and M. Ohlberger. ALGORITMY 2012 - Proceedings of contributed papers and posters, 1, page 393--403. Slovak University of Technology in Bratislava, Publishing House of STU, (April 2012)
M. Hintermüller, and A. Langer. Domain decomposition methods in science and engineering XXI, volume 98 of Lecture notes in computational science and engineering, page 829-837. Springer, (2014)