@article {Planck1901, title = {Distribution of energy in the spectrum}, journal = {Annalen der Physik}, volume = {4}, year = {1901}, note = {
}, month = {03/1901}, pages = {553-563}, author = {M. Planck} } @article {Planck1900, title = {Distribution of energy in the normal spectrum}, journal = {Verhandlungen der Deutschen Physikalischen Gesellschaft}, volume = {2}, year = {1900}, note = {
}, pages = {237-245}, author = {M. Planck} }