@article{MABA_2003_17_3-4_a9,
     author = {Adrijan V. Borisov and Margarita G. Spirova},
     title = {Measurability of {Sets} of {Pairs} of {Planes} in the {Simply} {Isotropic} {Space}},
     journal = {Mathematica balkanica},
     pages = {291},
     publisher = {mathdoc},
     volume = {17},
     number = {3-4},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/MABA_2003_17_3-4_a9/}
}