@article{DCG_1992__8_1_131214,
     author = {H.N. Djidjev and A. Lingas and J.R. Sack},
     title = {Nonuniqueness {Results} for {X-Ray} {Problems} with {Point} {Sources.}},
     journal = {Discrete & computational geometry},
     pages = {153--170},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DCG_1992__8_1_131214/}
}