Ion beam machining of niobium weakly superconducting microbridges R. Adde, P. Crozat, S. Gourrier, G. Vernet, M. Bernheim et D. Zenatti Rev. Phys. Appl. (Paris), 9 1 (1974) 179-181 DOI: 10.1051/rphysap:0197400901017900