@article{vonHippel:20068r, author = "von Hippel, Georg", title = "{Leptonic widths of heavy quarkonia: QCD/NRQCD matching for the electromagnetic current at O(alpha_s v^2)}", doi = "10.22323/1.032.0098", journal = "PoS", year = 2006, volume = "LAT2006", pages = "098" }