Source: https://www.researchgate.net/profile/Oscar_Cordon/publication/28246034_A_GA-P_algorithm_to_automatically_formulate_extended_boolean_queries_for_a_fuzzy_information_retrieval_system_by_means_of_GA-P_techniques/links/02bfe5114bc6c18241000000/A-GA-P-algorithm-to-automatically-formulate-extended-boolean-queries-for-a-fuzzy-information-retrieval-system-by-means-of-GA-P-techniques.pdf