@article{IVM_1995_1_a2,
     author = {A. S. Vernitskiǐ and M. V. Volkov},
     title = {A proof and generalization of the {Higgins} theorem on divisors of semigroups of isotonic transformations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {38--44},
     publisher = {mathdoc},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1995_1_a2/}
}