[app/...] fix source URLs
[app/90] new demo

some input data is missing here
[app/90] some simnplification and cleanup

* use math.sqrt instead of numpy.sqrt
* remove print (log pollution)
[app/90] add preprint link, fix title
[app/45] fix dirname, url and title
[app/45] source URL
[app/90] add missing input files
Merge branch 'dev_app45_withdata'
[app/45] fix heavy input location
Merge branch 'dev_app45_withdata'