@article{10_4064_fm_66_1_61_63,
     author = {Paul Schupp},
     title = {A note on recursively enumerable predicates in groups},
     journal = {Fundamenta Mathematicae},
     pages = {61--63},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1970},
     doi = {10.4064/fm-66-1-61-63},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-66-1-61-63/}
}