Current state and future of PRC (in Czech only)
Hadinec J & Kovář P, Živa 1996/4
Stančík D, Živa 1998/1
Hadinec J, Živa 1998/4
Suda J, Živa 2001/5

History and importance of PRC (in Czech only)
Přírodovědeci 2013https://www.prirodovedci.cz/magazin/herbarove-sbirky-zive-archivy-biologicke-rozmanitosti
iForum 2014http://iforum.cuni.cz/IFORUM-15194.html

The oldest type collections
Kirschner et al, Preslia 79: 323-365, 2007