 <span class="citation">(2018)</span> show that energy
balance is verified by</p>
<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>ùêñ</mi><mo>=</mo><msup><mi>ùêï</mi><mi mathvariant="normal">T</mi></msup><mo>‚àí</mo><mi>ùêî</mi><mo>,</mo></mrow><annotation encoding="application/x-tex">\mathbf{W} = \mathbf{V}^\mathrm{T} - \mathbf{U},</annotation></semantics></math></p>
<p>and</p>
<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"