Topical issue on Exploring Strongly Interacting Matter at High Densities - NICA White PaperDavid Blaschke, Jörg Aichelin, Elena Bratkovskaya, Volker Friese, Marek Gazdzicki, Jørgen Randrup, Oleg Rogachevsky, Oleg Teryaev and Viacheslav ToneevEur. Phys. J. A, 52 8 (2016) 267DOI: https://doi.org/10.1140/epja/i2016-16267-x