@article{10_4153_CMB_1973_076_6,
     author = {Michael, I. M.},
     title = {Finite-Dimensional {Extensions} of {Certain} {Symmetric} {Operators(1)}},
     journal = {Canadian mathematical bulletin},
     pages = {455--456},
     year = {1973},
     volume = {16},
     number = {3},
     doi = {10.4153/CMB-1973-076-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-076-6/}
}