* Discovery of probably Tunguska meteorites at the bottom of Khushmo river's shoal Dr. Andrei E. Zlobin, Paper 1304.8070 in arXiv.org (PDF)* Tunguska similar impacts and origin of life Dr. Andrei E. Zlobin, Paper 1402.1408 in arXiv.org (PDF)* Tunguska similar impacts and origin of life Dr. Andrei E. Zlobin, article in electronic journal "Modern scientific researches and innovations.
Dandanes so jih v običajni uporabi že povsem nadomestili žičniki, drugačni se uporabljajo le v restavratorstvu.