@article{JMAG_2000_7_1_a5,
     author = {Ts. Bayasgalan},
     title = {The numerical range of linear relations in spaces with an indefinite metric},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {115--118},
     year = {2000},
     volume = {7},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2000_7_1_a5/}
}