DOI names are not correctly extracted when a line break exists within the DOI name

[jeffnawroth]

DOI names are not correctly extracted when a line break exists within the DOI name. This issue needs to be addressed to ensure proper extraction of DOI names regardless of formatting.

Example:

Chen, J., Dowman, I., Li, S., Li, Z., Madden, M., Mills, J., & Heipke, C. (2016). Information
from imagery: ISPRS scientific vision and research agenda. ISPRS Journal of
Photogrammetry and Remote Sensing, 115, 3–21. https://doi.org/10.1016/j.isprsjprs.
2015.09.008.