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Variational perturbation theory
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<h2 id="external-links">External links</h2> <ul><li><a href="/facts/Hagen_Kleinert/1vF2CVlD">Kleinert H.</a>, <i>Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets</i>, 3. Auflage, <a href="http://www.worldscibooks.com/physics/5057.html">World Scientific (Singapore, 2004)</a> (readable online <a href="http://www.physik.fu-berlin.de/~kleinert/b5">here</a>) (see Chapter 5)</li> <li><a href="/facts/Hagen_Kleinert/1vF2CVlD">Kleinert H.</a> and Verena Schulte-Frohlinde, <i>Critical Properties of φ4-Theories</i>, <a href="http://www.worldscibooks.com/physics/4733.html">World Scientific (Singapur, 2001)</a>; Paperback <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 981-02-4658-7 (readable online <a href="http://www.physik.fu-berlin.de/~kleinert/b8">here</a>) (see Chapter 19)</li> <li><a href="/facts/Richard_P._Feynman/32vGFrtB">Feynman, R. P.</a>; <a href="/facts/Hagen_Kleinert/1vF2CVlD">Kleinert, H.</a> (1986). <a href="https://authors.library.caltech.edu/3553/1/FEYpra86.pdf">"Effective classical partition functions"</a> (PDF). <i><a href="/facts/Physical_Review_A/SyUn09fY">Physical Review A</a></i>. 34 (6): 5080–5084. <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/1986PhRvA..34.5080F">1986PhRvA..34.5080F</a>. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1103%2FPhysRevA.34.5080">10.1103/PhysRevA.34.5080</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/9897894">9897894</a>.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Kleinert, H. (1995). "Systematic Corrections to Variational Calculation of Effective Classical Potential" (PDF). Physics Letters A. 173 (4–5): 332–342. Bibcode:1993PhLA..173..332K. doi:10.1016/0375-9601(93)90246-V. <a href="/wiki/Hagen_Kleinert" target="_blank">/wiki/Hagen_Kleinert</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Kleinert, H.; Janke, W. (1993). "Convergence Behavior of Variational Perturbation Expansion - A Method for Locating Bender-Wu Singularities" (PDF). Physics Letters A. 206 (5–6): 283–289. arXiv:quant-ph/9509005. Bibcode:1995PhLA..206..283K. doi:10.1016/0375-9601(95)00521-4. <a href="/wiki/Hagen_Kleinert" target="_blank">/wiki/Hagen_Kleinert</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Guida, R.; Konishi, K.; Suzuki, H. (1996). "Systematic Corrections to Variational Calculation of Effective Classical Potential". Annals of Physics. 249 (1): 109–145. arXiv:hep-th/9505084. Bibcode:1996AnPhy.249..109G. doi:10.1006/aphy.1996.0066. <a href="/wiki/Annals_of_Physics" target="_blank">/wiki/Annals_of_Physics</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Kleinert, H. (1998). "Strong-coupling behavior of φ^4 theories and critical exponents" (PDF). Physical Review D. 57 (4): 2264. Bibcode:1998PhRvD..57.2264K. doi:10.1103/PhysRevD.57.2264. <a href="/wiki/Hagen_Kleinert" target="_blank">/wiki/Hagen_Kleinert</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>