@article{10_2140_agt_2010_10_627,
     author = {Pajitnov, Andrei},
     title = {On the tunnel number and the {Morse{\textendash}Novikov} number of knots},
     journal = {Algebraic and Geometric Topology},
     pages = {627--635},
     year = {2010},
     volume = {10},
     number = {2},
     doi = {10.2140/agt.2010.10.627},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2010.10.627/}
}