@techreport{TR-01-01,
 author = {Luboš Brim and Ivana Černá and  Pavel Krčál 
and Radek Pelánek},
 institution = {Faculty of Informatics, Masaryk University},
 number = {FIMU-RS-2001-01},
 title = {Distributed Shortest Paths for Directed Graphs 
with Negative Edge Lengths },
 year = {2001}
}