@article{NSJOM_2010_40_2a_17,
     author = {Erkko Lehtonen},
     title = {A note on minors determined by
 clones of semilattices},
     journal = {Novi Sad Journal of Mathematics},
     pages = {75-81},
     year = {2010},
     volume = {40},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2010_40_2a_17/}
}