Quizá quiso decir: Materials ; 228. Materials ; 228. Graduate Texts in Mathematics, 0072-5285 ; 228 IFIP International Federation for Information Processing, 1571-5736 ; 228 ABCT Clinical Assessment Series, 1869-2281 Operator Theory: Advances and Applications ; 228 Springer Tracts in Modern Physics, 0081-3869 ; 228 Studies in Fuzziness and Soft Computing, 1434-9922 ; 228 Studies in Computational Intelligence, 1860-949X ; 228 Advances in Polymer Science, 0065-3195 ; 228 Communications in Computer and Information Science, 1865-0929 ; 228 Lecture Notes in Electrical Engineering, 1876-1100 ; 228 Advances in Intelligent Systems and Computing, 2194-5357 ; 228 Springer INdAM Series, 2281-518X ; 1 Perspectives in Business Culture, 2280-1464 Perspectives in Business Culture, 2280-1464 Perspectives in Business Culture, 2280-1464 ; 2 SIMAI Springer Series, 2280-840X Springer INdAM Series, 2281-518X ; 4 Anesthesia, Intensive Care and Pain in Neonates and Children, 2281-1788