@article{10_21136_MB_2010_140698,
     author = {Hilscher, Roman \v{S}imon and Zem\'anek, Petr},
     title = {Friedrichs extension of operators defined by linear {Hamiltonian} systems on unbounded interval},
     journal = {Mathematica Bohemica},
     pages = {209--222},
     publisher = {mathdoc},
     volume = {135},
     number = {2},
     year = {2010},
     doi = {10.21136/MB.2010.140698},
     mrnumber = {2723088},
     zbl = {1220.47028},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2010.140698/}
}