Date of birth	1922
Date of death	1999
Occupation	professori
Field of Activity	limnologia
Other Forms of Name	Ryhänen, R (1922-1999)
Identifiers	0000000397531854 (isni) http://urn.fi/URN:NBN:fi:au:finaf:000057455 (finaf)
Associated Groups	Helsingin yliopisto (-)