@article{ZM02,
    author = {A.Z. Zelikovsky and I.I. Mandoiu},
    title = {Practical approximation algorithms for zero- and bounded-skew trees},
    journal = {SIAM Journal on Discrete Mathematics},
    year = {2002},
    volume = {15},
    pages = {97-111},
    url = {http://dx.doi.org/10.1137/S0895480100378367},
    file = {ZM02.pdf},
    confidential = {n}
}