Cabral, A, R Portela, T Tasso, F Eusébio, A Guilherme, L Lorga, I T De Almeida, C Silveira, and M L Levy. 1989. “Phenylketonuria--Physical and Mental Development of Phenylketonuric Children Subjected to Early Treatment”. Acta Médica Portuguesa 2 (1). Lisbon, Portugal:1-5. https://doi.org/10.20344/amp.3451.