Jürgen Sprekels, Heinrich Voss. Bounds and domains of existence for hyperbolic initial value problems. Computing, 23(1):73-83, 1979. [doi]
@article{SprekelsV79,
title = {Bounds and domains of existence for hyperbolic initial value problems},
author = {Jürgen Sprekels and Heinrich Voss},
year = {1979},
doi = {10.1007/BF02252615},
url = {http://dx.doi.org/10.1007/BF02252615},
researchr = {https://researchr.org/publication/SprekelsV79},
cites = {0},
citedby = {0},
journal = {Computing},
volume = {23},
number = {1},
pages = {73-83},
}