Beverland M.E., J. Haah, G. Alagic, G.K. Campbell, A.M. Rey, and A.V. Gorshkov, Physical Review Letters 120, (2018).
Beverland M.E., G. Alagic, M.C. Martin, A.P. Koller, A.M. Rey, and A.V. Gorshkov, Physical Review A 93, 051601 (2016).
Koller A.P., M.E. Beverland, A.V. Gorshkov, and A.M. Rey, Physical Review Letters 112, 123001 (2014).