@article{PORMA_1977__36_3-4_115321,
     author = {Khan, M.Z. and Ansari, A.H.},
     title = {A note on certain subgroups of {Hom}},
     journal = {Portugaliae mathematica},
     pages = {251--255},
     publisher = {mathdoc},
     volume = {36},
     number = {3-4},
     year = {1977},
     mrnumber = {0597847},
     zbl = {0453.18008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_3-4_115321/}
}