@article{MS2_1997__80_2_167414,
     author = {Ole Rask Jensen},
     title = {Construction of vacuum for the positive-energy representation and its {Bose} counterpart.},
     journal = {Mathematica Scandinavica},
     pages = {101--106},
     publisher = {mathdoc},
     volume = {80},
     number = {2},
     year = {1997},
     zbl = {0907.46059},
     url = {http://geodesic.mathdoc.fr/item/MS2_1997__80_2_167414/}
}