<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1460963583152_2842">Dear WIEN2k user,</div><div id="yui_3_16_0_ym19_1_1460963583152_2842">Can you guide me how i can find "third order of elastic constants" using energy approach?</div><div id="yui_3_16_0_ym19_1_1460963583152_2842">with best,</div><div id="yui_3_16_0_ym19_1_1460963583152_2842">A. lot</div></div></body></html>