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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2020-11-1-36-43</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-465</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>Geometrical analyses of nanostructures</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sajfert</surname><given-names>V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Djure Djakovica Street bb, 23000 Zrenjanin</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Pop</surname><given-names>N.</given-names></name></name-alternatives><bio xml:lang="en"><p>V. Parvan. No.2, 300223, Timisoara</p></bio><email xlink:type="simple">nicolina.pop@upt.ro</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Popov</surname><given-names>D.</given-names></name></name-alternatives><bio xml:lang="en"><p>V. Parvan. No.2, 300223, Timisoara</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="en">Technical Faculty “Mihajlo Pupin” Zrenjanin<country>Serbia</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="en">Department of Physical Foundations of Engineering, Politehnica University of Timis¸oara<country>Romania</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>31</day><month>07</month><year>2025</year></pub-date><volume>11</volume><issue>1</issue><elocation-id>36–43</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Sajfert V., Pop N., Popov D., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Sajfert V., Pop N., Popov D.</copyright-holder><copyright-holder xml:lang="en">Sajfert V., Pop N., Popov D.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://nanojournal.ifmo.ru/jour/article/view/465">https://nanojournal.ifmo.ru/jour/article/view/465</self-uri><abstract><p>In this paper, the statistical and dynamical equivalence between rectangular cell and lower symmetry cell is presented. The achievement of this equivalence will improve theoretical investigations of nanostructures as thin film or quantum rods.</p></abstract><kwd-group xml:lang="en"><kwd>Nanostructures</kwd><kwd>triclinic cell</kwd><kwd>cubic cell</kwd><kwd>thin film</kwd></kwd-group><funding-group xml:lang="en"><funding-statement>This work was supported by a grant of the Romanian Ministry of Research and Innovation, project number 10PFE/16.10.2018, PERFORM-TECH-UPT – The increasing of the institutional performance of the Polytechnic University of Timis¸oara by strengthening the research, development and technological transfer capacity in the field of “Energy, Environment and Climate Change”, within Program 1 – Development of the national system of Research and Development, Subprogram 1.2 – Institutional Performance – Institutional Development Projects – Excellence Funding Projects in RDI, PNCDI III.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Kittel Ch. 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