@article{Alfsen_1963, title={A Simplified Constructive Proof of the Existence and Uniqueness of Haar Measure.}, volume={12}, url={https://www.mscand.dk/article/view/10675}, DOI={10.7146/math.scand.a-10675}, journal={MATHEMATICA SCANDINAVICA}, author={Alfsen, E. M.}, year={1963}, month={Dec.}, pages={106–116} }