@inbook{Michlin+1978+329+338,
url = {https://doi.org/10.1515/9783112471302-020},
title = {Kapitel 18. Das Problem der Richtungsableitung},
booktitle = {Partielle Differentialgleichungen in der Mathematischen Physik},
author = {S. G. Michlin},
editor = {S. Prössdorf},
publisher = {De Gruyter},
address = {Berlin, Boston},
pages = {329--338},
doi = {doi:10.1515/9783112471302-020},
isbn = {9783112471302},
year = {1978},
lastchecked = {2026-05-11}
}