@incollection{MEM_2021_50_a21,
     author = {Staribratov, Ivaylo},
     title = {Some notes on the solutions of transportation problems},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {196--200},
     year = {2021},
     volume = {50},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a21/}
}