@article{10_37236_6196,
     author = {Mark Siggers},
     title = {Reflexive graphs with near unanimity but no semilattice polymorphisms},
     journal = {The electronic journal of combinatorics},
     year = {2018},
     volume = {25},
     number = {4},
     doi = {10.37236/6196},
     zbl = {1401.05253},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/6196/}
}