@article{10_4064_aa152_3_1,
     author = {Titus Hilberdink},
     title = {Generalised prime systems with periodic
 integer counting function},
     journal = {Acta Arithmetica},
     pages = {217--241},
     publisher = {mathdoc},
     volume = {152},
     number = {3},
     year = {2012},
     doi = {10.4064/aa152-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa152-3-1/}
}