@inproceedings{paul1923sur, title={Sur l'intégrale $$\int {\log (z - \lambda )d\log (z - \mu )} $$ .}, author={Paul Appell}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203038880693330}, booktitle={Acta Mathematica}, volume={44}, number={1}, pages={217-218}, year={1923}, }