Gregory Gutin, Khee Meng Koh, Eng Guan Tay, Anders Yeo. On the number of quasi-kernels in digraphs. Journal of Graph Theory, 46(1):48-56, 2004. [doi]
@article{GutinKTY04,
title = {On the number of quasi-kernels in digraphs},
author = {Gregory Gutin and Khee Meng Koh and Eng Guan Tay and Anders Yeo},
year = {2004},
doi = {10.1002/jgt.10169},
url = {http://dx.doi.org/10.1002/jgt.10169},
researchr = {https://researchr.org/publication/GutinKTY04},
cites = {0},
citedby = {0},
journal = {Journal of Graph Theory},
volume = {46},
number = {1},
pages = {48-56},
}