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1. Influence of limimg and potassium fertilization on the competition between a legume and a grass / Ester M. A. C. Portela Monografia Publication Wageningen : [s.n.], 1981 Description 44 p. : il. ; 30 cm LocationBiblioteca da UTAD Availability Available (3).

2. Solos e fertilidade / Ester M. Abranches Costa Portela Monografia Publication Vila Real : [s.n.], 1990 Description [1], 81 p. : il. ; 30 cm LocationBiblioteca da UTAD Availability Available (3).

3. Some reflections on soil acidity / Ester M. A. C. Portela Monografia Publication Wageningen : [s.n.], 1981 Description 43 p. : il. ; 30 cm LocationBiblioteca da UTAD Availability Available (2).