Professor Risto Tuomikoski memorial issueTimo Koponen, Sinikka Piippo, Isoviita, Pekka, ǂd 1931- · First published 2013Open the Tome
Typification of Drepanocladus sendtneri (Musci, Amblystegiaceae)Pekka Isoviita, Timo Koponen · First published 1981Open the Tome