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2. Frequency and replication status of the fragile X, fra(X)(q27-28), in a pair of monozygotic twins of markedly differing intelligence;Tuckerman, E.; Webb, T.; Bundey, S.E.;J Med Genet,1985
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4. Colour vision deficiency in one of two presumably monozygotic twins with secondary amenorrhoea;Philip, J.; Vogelius Andersen, C.H.; Dreyer, V.;Ann Hum Genet
5. Different patterns of X inactivation in MZ twins discordant for redgreen colour-vision deficiency;Jorgenson, A.L.; Philip, J.; Raskind, W.H.;Am 7 Hum Genet,1992