@article{10_4064_fm_92_3_223_245,
     author = {D. Jensen and A. Ehrenfeucht},
     title = {Some problem in elementary arithmetics},
     journal = {Fundamenta Mathematicae},
     pages = {223--245},
     publisher = {mathdoc},
     volume = {92},
     number = {3},
     year = {1976},
     doi = {10.4064/fm-92-3-223-245},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-92-3-223-245/}
}