@Article{JosP06,
author = {Michael Joswig and Marc E. Pfetsch},
title = {Computing Optimal {M}orse Matchings},
journal = {SIAM J. Discrete Math.},
year = {2006},
volume = {20},
number = {1},
pages = {11--25},
doi = {10.1137/S0895480104445885}
}