https://matogreiser.no/?p=231
Piggvar med kamskjell – Toril
piggvarmedtoril
https://akvaplan.no/en/pub/hdl/11250/3723803
1.3. Piggvar. Havbruksrapport 1997 – Akvaplan-niva
Akvaplan-niva is a not-for profit research institute focusing on water, ocean, and arctic issues
piggvarniva