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The Scientific Information System Redalyc is a bibliographic database and a digital library of Open Access journals, supported by the Universidad Autónoma del Estado de México with the help of numerous other higher education institutions and information systems.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...
The Sistema Central is a primary feature of the Meseta Central, the inner Iberian plateau, splitting the meseta into two parts.The Sistema Central runs in an ENE - WSW direction roughly along the southern border of the Spanish autonomous community of Castile and León and Extremadura continuing into the Guarda and Castelo Branco districts in Portugal.
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Latindex (Regional Cooperative Online Information System for Scholarly Journals from Latin America, the Caribbean, Spain and Portugal) is a bibliographical information system available for free consultation.
The Periferico was originally planned by architect Carlos Contreras as early as 1925, together with other major roads such as the Viaducto Miguel Alemán. Some parts of the beltway were built to follow the bed of a river; the flow of the river was modified to flow through a pipe. [1]