Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Guanming Lai and Zhihua Ding,Enhancement of axial optical trapping force using a pair of axicons,Technical Digest. CLEO/Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464),,IEEE,2003-01-20,2,,369-370,https://cir.nii.ac.jp/crid/1870020692762056064,https://doi.org/10.1109/cleopr.1999.811474