@article{10_21136_CMJ_1973_101153,
     author = {Schwarz, \v{S}tefan},
     title = {The semigroup of fully indecomposable relations and {Hall} relations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {151--163},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1973},
     doi = {10.21136/CMJ.1973.101153},
     mrnumber = {0316612},
     zbl = {0261.20057},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1973.101153/}
}