Quizá quiso decir: VullSaber ; 53. Ensayos ; 531. Ensayos ; 533. Religión ; 539. Ensayos ; 532. Religión ; 539. Grupos & Instituciones no. 53 Language Policy, 1571-5361 ; 5 Language Policy, 1571-5361 ; 6 Language Policy, 1571-5361 ; 7 Language Policy, 1571-5361 ; 9 Texts Applied in Mathematics, 0939-2475 ; 53 Advances in Information Security, 1568-2633 ; 53 Pediatric Oncology, 1613-5318 Communications and Control Engineering, 0178-5354 Communications and Control Engineering, 0178-5354 Communications and Control Engineering, 0178-5354 Communications and Control Engineering, 0178-5354 Communications and Control Engineering, 0178-5354 Communications and Control Engineering, 0178-5354