@Article{,
 author = {P. Sevastsyanau, P. Figat},
 title = {Aggregation of aggregating modes in MCDM: Synthesis of Type 2 and Level 2 fuzzy sets},
 journal = {Omega},
 year = {2007},
 volume = {35},
 number = {5},
 pages = {505--523},
 month = {October}
 }