{"article":{"@attributes":{"key":"journals\/siamdm\/DraganYL06","mdate":"2020-04-25"},"author":["Feodor F. Dragan","Chenyu Yan","Irina Lomonosov"],"title":"Collective tree spanners of graphs.","pages":"241-260","year":"2006","volume":"20","journal":"SIAM J. Discret. Math.","number":"1","ee":"https:\/\/doi.org\/10.1137\/S089548010444167X","url":"db\/journals\/siamdm\/siamdm20.html#DraganYL06"}}