Apache Airavata: design and directions of a science gateway framework. - Marlon E. Pierce; Suresh Marru; Lahiru Gunathilake; Don Kushan Wijeratne; Raminder Singh; Chathuri Wimalasena; Shameera Ratnayaka; Sudhakar Pamidighantam (Concurr. Comput. Pract. Exp., 2015)