Evolution of defects in nanoporous gold with annealing temperature using low-energy positron beam experimentsC. Lakshmanan, R. N. Viswanath, R. Rajaraman, S. Dash, G. Amarendra and C. S. SundarEPL, 117 4 (2017) 48007DOI: https://doi.org/10.1209/0295-5075/117/48007