State space relaxation for set covering problems related to bus driver scheduling

1993 ◽  
Vol 71 (2) ◽  
pp. 303-316 ◽  
Author(s):  
Ana Paias ◽  
J. Paixão
2011 ◽  
Vol 134 (2) ◽  
pp. 323-348 ◽  
Author(s):  
Edoardo Amaldi ◽  
Sandro Bosio ◽  
Federico Malucelli

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