00379nam a2200097Ia 4500008004100000082002800041100001800069245011200087260004600199650003600245220204s9999    xx            000 0 und d  a577.344:581.5(492)bPIE  aPIERIK, R L M 0aIntegrating photochemical light measurement: An ecological study iin the middacnten woodland in Netherland.  aNetherlandbAgricultural Universityc1965  aPhotochemical light measurement