1. Soc. of Chemical Ind.1889.
2. Soc. of Chemical Ind.1889.
3. Pyrochemische Untersuchungen vonCarlLangerundVictorMeyer.
4. A new form of Gas Battery byL.MondandC.Langer. Proceedings of the Royal Society vol. 46.
5. LudwigMondandC.Langer: Improvements in obtaining Hydrogen. E. P. No. 12608.1888.