@article{10_4064_fm221_2_2,
     author = {Rodney G. Downey and Asher M. Kach and Steffen Lempp and Daniel D. Turetsky},
     title = {Computable categoricity
 versus relative computable categoricity},
     journal = {Fundamenta Mathematicae},
     pages = {129--159},
     publisher = {mathdoc},
     volume = {221},
     number = {2},
     year = {2013},
     doi = {10.4064/fm221-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm221-2-2/}
}