The ski design is optimal for hunting elk and wild forest reindeer. The populations of those animals collapsed near the end of 1800, so hunting them became illegal. Since there was no more that specialized need, people switched to using general-purpose skis.
I browsed through the sources of that research paper; here are some picks;
This is in Finnish as well, but has some pictures when you scroll to the bottom:
https://www.kansallismuseo.fi/fi/kuukauden-esineet/2007/lyly-ja-kalhu-tornionjokilaaksostaI don't know if any of these are accessible on-line, but I'd guess you could consult your local library:
- WEINSTOCK, John 2005; The role of skis and skiing in the settlement of early Scandinavia, The Northern Review, #25/26.
- VILKUNA, Janne 1984; Ancient Skis of Central Finland, Fennoskandia archaeologica 1.
- OVSYANNIKOV, O.V. 1989; On old Russian skis. Fennoskandia archaeologica VI
- NASKALI, Eero 1999; An Ancient Skis. , from "Dig it all, Papers dedicated to Ari Siiriäinen" The Finnish Antiquarian Society the Archaeological Society of Finland, Jyväskylä.
-KANKAANPÄÄ, Jarmo 1997; People in cold environments, from "Early in the North", University of Helsinki Department of Archaeology, No. 10. Helsinki.
- JANIK, Liliana - ROUGHLEY, Corinne - SZEZCNA, Katarzyna, 2007; Skiing on the Rocks: the Experiential Art of Fisher-gather-hunters in Prehistoric Northern Russia, Cambridge Archaeological Journal, Volume 17, Issue 03, October 2007, 297-310.