Guerrero, B., M. Velandia, G. Fischer, and H. Montenegro. “Plant Extracts Carboxylic Acids and Soil Humidity Influence Production and Cracking of Cape Gooseberry (Physalis Peruviana L.) Fruit”. Revista Colombiana De Ciencias Hortícolas, Vol. 1, no. 1, Jan. 2011, pp. 9-20, doi:10.17584/rcch.2007v1i1.1141.