Eliseev, S., Nesterenko, D., Blaum, K., Block, M., Droese, C., Herfurth, F., et al. (2011). Q values for neutrinoless double-electron capture in 96Ru, 162Er, and 168Yb. Physical Review C, 83(3): 038501, pp. 1-3. doi:10.1103/PhysRevC.83.038501.