@article{10_4064_ap77_1_7,
     author = {Aris Tersenov},
     title = {On the solvability of the {Lyapunov} equation for
nonselfadjoint differential operators of order $2m$
with nonlocal boundary conditions},
     journal = {Annales Polonici Mathematici},
     pages = {79--104},
     publisher = {mathdoc},
     volume = {77},
     number = {1},
     year = {2001},
     doi = {10.4064/ap77-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap77-1-7/}
}