@article {Planck1901,
	title = {Distribution of energy in the spectrum},
	journal = {Annalen der Physik},
	volume = {4},
	year = {1901},
	note = {<br />},
	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 = {<br />},
	pages = {237-245},
	author = {M. Planck}
}
