Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X Articles in Press 2011 05 04 k-forested choosability of graphs with bounded maximum average degree en Xin Zhang School of Mathematics Shandong University Guizhen Liu School of Mathematics Shandong University Jian-Liang Wu School of Mathematics Shandong University 2011 05 02 k-forested coloring linear coloring maximum average degree