@article{AMI_2015_44_a17,
     author = {P\'eter Tak\'acs and Zolt\'an Ern\H{o} Csajb\'ok and Tam\'as Mih\'alyde\'ak},
     title = {Boundaries of membrane in {P} systems relying on multiset approximation spaces in language {R}},
     journal = {Annales mathematicae et informaticae},
     pages = {197--210},
     publisher = {mathdoc},
     volume = {44},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2015_44_a17/}
}