@article{MASLO_1991_41_4_a1,
     author = {Pituk, Michal},
     title = {Adjoint operators and boundary value problems for linear differential equations},
     journal = {Mathematica slovaca},
     pages = {351--357},
     year = {1991},
     volume = {41},
     number = {4},
     mrnumber = {1149043},
     zbl = {0753.34009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1991_41_4_a1/}
}