1. ON THE MATHEMATICAL MODELS OF RIVER PROFILES. Authors: A.M. IMBROANE.2. PREPROCESSING DIGITAL ELEVATION MODELS USING AVENUE. Authors: A.T. CODILEAN, A.M. IMBROANE.3. SOME APLICATIONS OF THE VARIATIONAL CALCULUS IN THE DETERMINATION OF RIVER PROFILE BALANCE. Authors: A.M. IMBROANE.4. SPAŢIAL DATA CAPTURE IN GIS ENVIRONMENT. Authors: A.M. IMBROANE.