Verification of Stefan’s law
1.https://www.iitr.ac.in/departments/PH/uploads/Teaching%20Laboratory/Thermal/6.%20Stephans%20Constant.pdf
2. http://www.iiserpune.ac.in/~bhasbapat/phy221_files/StephansLaw.pdf
3. https://iopscience.iop.org/article/10.1088/0031-9120/10/1/005/pdf
4. https://aapt.scitation.org/doi/10.1119/1.11299
5. https://www.gopracticals.com/physics/physics-verify-stefans-law