00812cam|a2200205|i|45000010006000000050017000060080041000230200015000640350017000790400039000960410008001351000023001432450176001662600074003423000035004164900037004515000069004885040014005578300035005716837720260715231444.0011212e        fi fd  f f    000 0 eng d  a9519469656  atr2001668377  aPOZN 93/AJcPOZN 93/AJdPOZN 93/OM0 aeng1 aHellsten, Seppo K.00aEffects of Lake Water Level Regulation on Aqautic Macrophyte Stands in Northern Finland and Options to Predict These Impacts under Varying Conditions /cSeppo K. Hellsten.00aHelsinki :bFinnish Zoological and Botanical Publishing Board,c2001.  a47 s. :brys., wykr. ;c25 cm.1 aActa Botanica Fennica ;vNo. 171  aPoprzednie zeszyty - zobacz czasopismo : Acta Botanical Fennica.  aBibliogr. 0aActa Botanica FennicavNo. 171