 |
| |||
подлёдный период (in contrast to open-water periods in rivers and lakes: The four lakes were sampled throughout the year between January and October 2017, except in April, when conditions were too precarious due to ice break-up, with 3 sampling dates in the under-ice period and 3–4 sampling dates in the open water period  frontiersin.org kadzeno) | |||
| ice-cover period: 3 phrases in 2 subjects |
| Hydrology | 1 |
| Makarov | 2 |