Kira Barton Jeroen van de Wijdeven Andrew Alleyne Okko Bosgra Maarten Steinbuch Norm optimal Cross-Coupled Iterative Learning Control. 3020-3025 2008 CDC http://dx.doi.org/10.1109/CDC.2008.4738973 conf/cdc/2008 db/conf/cdc/cdc2008.html#BartonWABS08