Preben D. Vestergaard. Graphs with two isomorphism classes of spanning unicyclic subgraphs. Graphs and Combinatorics, 7(2):197-204, 1991. [doi]
@article{Vestergaard91,
title = {Graphs with two isomorphism classes of spanning unicyclic subgraphs},
author = {Preben D. Vestergaard},
year = {1991},
doi = {10.1007/BF01788144},
url = {http://dx.doi.org/10.1007/BF01788144},
researchr = {https://researchr.org/publication/Vestergaard91},
cites = {0},
citedby = {0},
journal = {Graphs and Combinatorics},
volume = {7},
number = {2},
pages = {197-204},
}