@article{VMUMM_2011_3_a1,
     author = {A. A. Sorokin},
     title = {The length of joins in {Lambek} calculus},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {10--14},
     publisher = {mathdoc},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_3_a1/}
}