@article{AMI_2012_40_a9,
     author = {Shubh Narayan Singh and K. V. Krishna},
     title = {The rank and {Hanna} {Neumann} property of some submonoids of a free monoid},
     journal = {Annales mathematicae et informaticae},
     pages = {113--123},
     year = {2012},
     volume = {40},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2012_40_a9/}
}