1 http://hdl.handle.net/10338.dmlcz/142162 1 Obsah http://hdl.handle.net/10338.dmlcz/142166 Obsah List of open star clusters in emission nebulae http://hdl.handle.net/10338.dmlcz/142165 List of open star clusters in emission nebulae Photoelectric measurements of OB stars http://hdl.handle.net/10338.dmlcz/142164 Photoelectric measurements of OB stars A note on the accuracy of photographic photometry with Schmidt telescope http://hdl.handle.net/10338.dmlcz/142163 A note on the accuracy of photographic photometry with Schmidt telescope