J. Engels

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A systematic description of cacao clones. II. The discriminative value of qualitative characteristics and the practical compatability of the discriminative value of quantitative and qualitative descriptors

J. Engels, 1983, Euphytica.

The systematic description of cacao clones and its significance for taxonomy and plant breeding

J. Engels, 1986 .

Cacao descriptors, their states and modus operandi

G. Enríquez, B. Bartley, J. Engels, 1980 .

A systematic description of cacao clones. I. The discriminative value of quantitative characteristics

J. Engels, 1983, Euphytica.

A systematic description of cacao clones. III. Relationships between clones, between characteristics and some consequences for the cacao breeding

J. Engels, 1983, Euphytica.

Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 1. General introduction and 2. Inheritance of colour in uniformly coloured flowers

C. Spitters, A. C. Zeven, J. Engels, 1975, Euphytica.

Investigations of the inheritance of flower variegation in Mirabilis jalapa L. 3. Somatic chromosome number, 4. Distribution of the pigments and 5. Chromatographic studies

C. Spitters, A. C. Zeven, J. Engels, 1975, Euphytica.

Variation in Sechium edule in Central America

J. Engels, 1983, Journal of the American Society for Horticultural Science.

A systematic description of cacao clones. IV: Some evidences of tetraploid inheritance

J. Engels, 1984 .

Molecular markers for genebank management

M. Vicente, M. Smale, S. Kresovich, 2005 .