In parallel to his ICJ Membership, Tomka served in 2005 as an Arbitrator of the "Belgium/Netherlands Iron Rhine" Tribunal, which was presided over by ICJ Rosalyn Higgins and in 2007 Tomka has been Member of the ICSID "ad hoc" Committee in the case of "Malaysian Historical Salvors v. Government of Malaysia", which also comprises ICJ s Stephen M. Schwebel (President) and Mohamed Shahabuddeen. In 2009, Tomka was also on the "ad hoc" Committee in the "MCI Power Group v. Republic of Ecuador" Annulment Decision.