@article{PFMT_2015_2_a5,
     author = {Waqar Khan and Faisal Yousafzai and Asad Khan},
     title = {On ordered {Abel{\textendash}Grassmann{\textquoteright}s} groupoids},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {40--47},
     year = {2015},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2015_2_a5/}
}