Molina, M.; Pardo-de-Santayana, M.; García, E.; Aceituno-Mata, L.; Morales, R.; Tardío, J. Exploring the Potential of Wild Food Resources in the Mediterranean Region: Natural Yield and Gathering Pressure of the Wild Asparagus (Asparagus Acutifolius L.). Span. j. agric. res. 2012, 10, 1090-1100.