@article{AFM_1979_4_1_a14,
     author = {Pekka Sorjonen},
     title = {On linear relations in an indefinite inner product space},
     journal = {Annales Fennici Mathematici},
     pages = {169--192},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1979},
     doi = {10.5186/aasfm.1978-79.0424},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1978-79.0424/}
}