Falconer, Etta (1971). "Isotopes of some special quasigroup varieties". Acta Mathematica Academiae Scientiarum Hungaricae. 22 (1–2): 73–79. doi:10.1007/BF01895992. S2CID122284886.
Falconer, Etta (1971). "Isotopes of some special quasigroup varieties". Acta Mathematica Academiae Scientiarum Hungaricae. 22 (1–2): 73–79. doi:10.1007/BF01895992. S2CID122284886.