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NLPQLP
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<h2 id="external-links">External links</h2> <ul><li><a href="http://klaus-schittkowski.de/nlpqlp.htm">http://klaus-schittkowski.de/nlpqlp.htm</a></li> <li><a href="https://www.schittkowski.de/numericalsoftware_nlpqlp.php">https://www.schittkowski.de/numericalsoftware_nlpqlp.php</a></li></ul>