Vol. 31 2001 Nº2 CONTENTS ARTICLES A. G. Arrieta, L. A. Romero,  A. L. Sánchez, J. M. del Amo NEURAL NETWORK APPROACH TO GUN AND MUNITION RECOGNITION FROM SHOT SOUND 61 A. Cammilleri, E. P. Serrano SPLINE MULTIRESOLUTION ANALYSIS ON THE INTERVAL 65 C. G. Raspanti, J. L . Figueroa USE OF A CPWL APPROACH FOR OPERATIVITY ANALYSIS: A CASE STUDY 73 V. L. Ballarin, M. Brun, E. G. Moler SCALE INVARIANT TEXTURE CLASSIFICATION WITH MATHEMATICAL MORPHOLOGY 79 M. E. Mejail, A. C. Frery, J. Jacobo-Berlles, O. H. Bustos APPROXIMATION OF DISTRIBUTIONS FOR SAR IMAGES: PROPOSAL, EVALUATION AND PRACTICAL CONSEQUENCES 83 O. H. Bustos, A. G. Flesia, A. C. Frery PERFORMANCE OF SPECTRAL ESTIMATORS IN SIMULATED SYNTHETIC APERTURE RADAR IMAGES 93 V.Vilaplana, F. Marqués A REGION-BASED APPROACH TO FACE SEGMENTATION AND TRACKING IN VIDEO SEQUENCES 99 S. I. Biagiola, J. A. Solsona, R. H. Milocco TWO DIFFERENT APPROACHES FOR BIOMASS ESTIMATION IN BATCH BIOPROCESSES 107 B. Carlsson, R. H. Milocco A SIMPLE STRATEGY FOR CONTROLLING THE NITRATE CONCENTRATION IN AN ACTIVATED SLUDGE PROCESS USING EXTERNAL CARBON FLOW RATE 115 J. O. Morel, M. A. Jordan A RECURSIVE ALGORITHM FOR SET-VALUED OBSERVERS WITH DYNAMIC UNCERTAINTIES 121 M. A. Jordan, H. R. Bambill ON THE GLOBAL CONVERGENCE OF NONLINEAR NONCONVEX ESTIMATORS 127 J. Elorza, P. Burillo SUBLATTICES IN THE CLASS OF FUZZY CONSEQUENCE OPERATORS 133 GENERAL INFORMATION 139

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