Signatures of two-step impurity-mediated vortex lattice melting in Bose-Einstein condensatesThudiyangal Mithun, Somesh Chandra Ganguli, Pratap Raychaudhuri and Bishwajyoti DeyEPL, 123 2 (2018) 20004DOI: https://doi.org/10.1209/0295-5075/123/20004