@article{MAN_1964__155_161188,
     author = {K. MURASUGI},
     title = {The {Center} of a {Group} with a {Single} {Defining} {Relation.}},
     journal = {Mathematische Annalen},
     pages = {246--251},
     publisher = {mathdoc},
     volume = {155},
     year = {1964},
     zbl = {0119.02601},
     url = {http://geodesic.mathdoc.fr/item/MAN_1964__155_161188/}
}