@article{10_4064_cm_13_2_259_263,
     author = {K. Szymiczek},
     title = {On prime numbers p,q and r such that pq, pr, and qr are pseudoprimes},
     journal = {Colloquium Mathematicum},
     pages = {259--263},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1964},
     doi = {10.4064/cm-13-2-259-263},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-13-2-259-263/}
}