Multicellular aggregates: a model system for tissue rheology Tomita Vasilica Stirbat, Sham Tlili, Thibault Houver, Jean-Paul Rieu, Catherine Barentin and Hélène Delanoë-Ayari Eur. Phys. J. E, 36 8 (2013) 84 Published online: 12 August 2013 DOI: 10.1140/epje/i2013-13084-1