Paper presented at a symposium of the nineteenth annual meeting of the electron microscope Society of America, at the Pittsburgh, Pensylvania, on August 21, 1961
(1963)
Proceedings of a symposium held in Prague in August 9-11, 1965, organized by the J. Safarik Univ. and by the Inst. of experimental biology of the Slovak akad. of Sciences
(1966)
![Национална конференция с международно участие на тема: „Биологични растениевъдство, животновъдство и храни”, [27-28 ноември 2014 г., Троян] [Електронен ресурс] : доклади, постери](https://eclipse.agriacad.bg/storage/img/52/1006/T0156348.jpg?1788914030)