Christian Liebchen, Gregor Wünsch. The zoo of tree spanner problems. Discrete Applied Mathematics, 156(5):569-587, 2008. [doi]
@article{LiebchenW08,
title = {The zoo of tree spanner problems},
author = {Christian Liebchen and Gregor Wünsch},
year = {2008},
doi = {10.1016/j.dam.2007.07.001},
url = {http://dx.doi.org/10.1016/j.dam.2007.07.001},
researchr = {https://researchr.org/publication/LiebchenW08},
cites = {0},
citedby = {0},
journal = {Discrete Applied Mathematics},
volume = {156},
number = {5},
pages = {569-587},
}