@article{b-crgp-09
, author = {Sergey Bereg}
, title = {On Characterizations of Rigid Graphs in the Plane Using Spanning
Trees}
, journal = {Graphs and Combinatorics}
, year = {2009}
, volume = {25}
, number = {2}
, pages = {139--144}
, url = {http://dx.doi.org/10.1007/s00373-008-0836-2}
}