@article{10_4153_S0008439523000620,
     author = {Babu, Gajendra and Mishra, Hemant K.},
     title = {Block perturbation of symplectic matrices in {Williamson{\textquoteright}s} theorem},
     journal = {Canadian mathematical bulletin},
     pages = {201--214},
     year = {2024},
     volume = {67},
     number = {1},
     doi = {10.4153/S0008439523000620},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439523000620/}
}