@article{AMLG_1977__18_137921,
     author = {N. Georgieva},
     title = {Another simplification of the recursion scheme.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {1--4},
     publisher = {mathdoc},
     volume = {18},
     year = {1977},
     zbl = {0343.02026},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1977__18_137921/}
}