@article{Sorensen2005, 
     author = "S\"{o}rensen, Kenneth and Janssens, Gerrit K.", 
     doi = "10.1590/S0101-74382005000200004", 
     issn = "0101-7438", 
     journal = "Pesquisa Operacional", 
     link = "http://www.scielo.br/scielo.php?script=sci_arttext\&pid=S0101-74382005000200004\&lng=en\&nrm=iso\&tlng=en", 
     month = "aug", 
     number = "2", 
     pages = "219--229", 
     publisher = "SOBRAPO", 
     title = "An algorithm to generate all spanning trees of a graph in order of increasing cost", 
     uri = "http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-74382005000200004&lng=en&nrm=iso&tlng=en", 
     volume = "25", 
     year = "2005", 
}

Problems: 285