Jochen Könemann, R. Ravi. A Matter of Degree: Improved Approximation Algorithms for Degree-Bounded Minimum Spanning Trees. SIAM Journal on Computing, 31(6):1783-1793, 2002. [doi]
@article{KonemannR02,
title = {A Matter of Degree: Improved Approximation Algorithms for Degree-Bounded Minimum Spanning Trees},
author = {Jochen Könemann and R. Ravi},
year = {2002},
url = {http://epubs.siam.org/sam-bin/dbq/article/36917},
researchr = {https://researchr.org/publication/KonemannR02},
cites = {0},
citedby = {0},
journal = {SIAM Journal on Computing},
volume = {31},
number = {6},
pages = {1783-1793},
}