@article{10_4064_fm_95_3_167_171,
     author = {Leo Harrington and Alexander Kechris},
     title = {$\ensuremath{\Pi}^1_2$ singletons and $O^#$},
     journal = {Fundamenta Mathematicae},
     pages = {167--171},
     publisher = {mathdoc},
     volume = {95},
     number = {3},
     year = {1977},
     doi = {10.4064/fm-95-3-167-171},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-95-3-167-171/}
}