- tr.aroundtravels.com article-about-russia/…
- boolt.nbgnsc.ru download/118/Bulletin-118-2016-…...located in north piedmont part of the Crimean peninsula, as well as under conditions of Botanical garden named after I.I. Sprygin (the city of Penza).
- peoplepill.com i/ivan-sprygin
- http://botanicgarden.com.tr referanslarimiz.asp
- ermakvagus.com Europe/Russia/penza.htmlOn the territory of Penza there is a botanical garden named after I. I. Sprygin (created in 1917), divided into three sections: dendrological (about 230 plant species)...
- visitcopenhagen.com copenhagen/planning/botanical…
- vandusengarden.org explore/vandusen-botanical-…
- http://chnbg.cn en_home.html