3 literature references for Sphagnum isoviitae Flatberg, 1992:

Author: Cardot
Year: 1910
Title:
Source: Rev. Bryol.
Author: Brotherus
Year: 1895
Title:
Source: Bih. Kongl. Svenska Vetensk.-Akad. Handl.
Author: Flatberg
Year: 1992
Title:
Source: J. Bryol.