@article{AMLG_1980__20_137964,
     author = {Leo Harrington},
     title = {Extensions of countable infinitary logic which preserve most of its nice properties.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {95--102},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     zbl = {0473.03031},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1980__20_137964/}
}