@article{EMJ_2014_5_4_a3,
     author = {G. Freiling and V. Yurko},
     title = {Recovering {Sturm--Liouville} operators on hedgehog-type graphs with general matching conditions},
     journal = {Eurasian mathematical journal},
     pages = {56--69},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2014_5_4_a3/}
}