Quizá quiso decir: Essentials in Cytopathology, 1574-9053 ; 9 Studies in Computational Intelligence, 1860-949X ; 9 Topics in Heterocyclic Chemistry, 1861-9282 ; 9 Studies in Computational Intelligence, 1860-949X ; 90 Studies in Computational Intelligence, 1860-949X ; 92 Studies in Computational Intelligence, 1860-949X ; 93 Studies in Computational Intelligence, 1860-949X ; 95 Studies in Computational Intelligence, 1860-949X ; 94 Studies in Computational Intelligence, 1860-949X ; 96 Studies in Computational Intelligence, 1860-949X ; 97 Studies in Computational Intelligence, 1860-949X ; 91 Studies in Computational Intelligence, 1860-949X ; 98 Studies in Computational Intelligence, 1860-949X ; 99 The Handbook of Environmental Chemistry, 1867-979X ; 9 Lecture Notes of the Unione Matematica Italiana, 1862-9113 ; 9 Signaling and Communication in Plants, 1867-9048 ; 9 Lecture Notes in Computational Vision and Biomechanics, 2212-9391 ; 9 ISO 9001 Standard. ISO 9001 Standard. ISO 9000 Series Standards.