scholarly journals Combinatorial Characterization of Upward Planarity

2019 ◽  
Vol 7 (2) ◽  
pp. 207-223
Author(s):  
Xuexing Lu ◽  
Yu Ye
2009 ◽  
Vol 39 (2) ◽  
pp. 455-462
Author(s):  
Youngju Choie ◽  
Olav K. Richter

1981 ◽  
Vol 44 (2) ◽  
pp. 241-247 ◽  
Author(s):  
Jonathan L. Gross ◽  
Ronald H. Rosen

2003 ◽  
Vol 87 (6) ◽  
pp. 295-300 ◽  
Author(s):  
Juan Luis Esteban ◽  
Jacobo Torán

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