Handbook of Chemical and Biological Warfare Agents - D. Hank Ellison - Google Books

https://books.google.de/books?id=G4xKKcgWTrsC&pg=PA233&dq=novichok+latency+period+30+seconds+to+2+minutes&hl=de&sa=X&ved=0ahUKEw

With terrorist groups expanding their weapons of destruction beyond bombs and bullets, chemical and biological warfare agents aren't merely limited to the battlefield anymore. In some cases, they are now being used on a new front: major metropolitan…