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APA Citation
Wen, J., Gao, B., Zhu, G., Cheng, Y., Zhu, S., & Wang, L. (2020). observation of multiramp fractional vortex beams and their total vortex strength in free space. Optics & laser technology, 131, . http://access.bl.uk/ark:/81055/vdc_100106376138.0x00005a