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@unpublished{wu:fel2019-tud01,
author = {Y.K. Wu and S.V. Benson and H. Hao and P. Liu and S.F. Mikhailov and V. Popov and J. Yan},
% author = {Y.K. Wu and S.V. Benson and H. Hao and P. Liu and S.F. Mikhailov and V. Popov and others},
% author = {Y.K. Wu and others},
title = {{Generating Orbital Angular Momentum Beams in an FEL Oscillator}},
booktitle = {Proc. FEL'19},
language = {english},
intype = {presented at the},
series = {Free Electron Laser Conference},
number = {39},
venue = {Hamburg, Germany},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {nov},
year = {2019},
note = {presented at FEL2019 in Hamburg, Germany, unpublished},
}