1.
Purmalis O, Kļaviņš L, Arbidans L. COMPOSITION AND QUALITY OF FRESHWATER LAKE SEDIMENTS (BALVU AND PĒRKONU LAKES). ETR [Internet]. 2019 Jun. 20 [cited 2024 Nov. 22];1:229-35. Available from: https://journals.ru.lv/index.php/ETR/article/view/4129