Contents of volume 15-2 (2011)
Ivo Marek, Aggregation/disaggregation as a theoretical tool 3 Lauri Tart, On Morita equivalence of partially ordered semigroups with local units 15 Talat Körpinar and Essin Turhan, On characterization of horizontal biharmonic curves in H2xR 35 Carl-Erik Särndal and Imbi Traat, Domain estimators calibrated on information from another survey 43 Oleg Gutik, Dušan Pagon and Kateryna Pavlyk, Congruences on bicyclic extensions of a linearly ordered group 61 Webmaster