BibTex format
@unpublished{Chaplain:2019:10.1103/PhysRevB.99.220102,
author = {Chaplain, GJ and Craster, R},
doi = {10.1103/PhysRevB.99.220102},
publisher = {AMER PHYSICAL SOC},
title = {Flat lensing by graded line meta-arrays},
url = {http://dx.doi.org/10.1103/PhysRevB.99.220102},
year = {2019}
}