Fuchs, L.; Kertész, A.; Szele, T. (1953). “On a special kind of duality in group theory. I” (영어). 《Acta Mathematica Academiae Scientiarum Hungaricae》 4: 169–178. doi:10.1007/BF02020362. ISSN0001-5954. MR0057883. Zbl0052.02201.
Fuchs, L.; Kertész, A.; Szele, T. (1953). “On a special kind of duality in group theory. I” (영어). 《Acta Mathematica Academiae Scientiarum Hungaricae》 4: 169–178. doi:10.1007/BF02020362. ISSN0001-5954. MR0057883. Zbl0052.02201.
Fuchs, L.; Kertész, A.; Szele, T. (1953). “On a special kind of duality in group theory. I” (영어). 《Acta Mathematica Academiae Scientiarum Hungaricae》 4: 169–178. doi:10.1007/BF02020362. ISSN0001-5954. MR0057883. Zbl0052.02201.
Fuchs, L.; Kertész, A.; Szele, T. (1953). “On a special kind of duality in group theory. I” (영어). 《Acta Mathematica Academiae Scientiarum Hungaricae》 4: 169–178. doi:10.1007/BF02020362. ISSN0001-5954. MR0057883. Zbl0052.02201.