[n] J. W. Guo, “Recent development of FRIB 28 GHz ECR ion source”, presented at the ECRIS'22, Ahmedabad, India, Oct. 2022, paper WET2AUCO01, unpublished.
%\cite{Guo:ECRIS22-WET2AUCO01} \bibitem{Guo:ECRIS22-WET2AUCO01} J. W. Guo, \textquotedblleft{Recent development of FRIB 28 GHz ECR ion source}\textquotedblright, presented at the ECRIS’22, Ahmedabad, India, Oct. 2022, paper WET2AUCO01, unpublished.
@unpublished{guo:ecris22-wet2auco01, author = {J. W. Guo}, title = {{Recent development of FRIB 28 GHz ECR ion source}}, pages = {}, paper = {WET2AUCO01}, venue = {Ahmedabad, India, Oct. 2022}, intype = {presented at the}, series = {International Workshop on ECR Ion Sources}, number = {25}, publisher = {JACoW Publishing, Geneva, Switzerland}, note = {presented at ECRIS'22, Ahmedabad, India, Oct. 2022, paper WET2AUCO01, unpublished}, language = {english} }