@article{21507, author = "Seminar - in - Depht 18 - 19 January 1971, El Paso, Texas", title = "Optical Tracking Systems. Seminar - in - Depht 18 - 19 January 1971, El Paso, Texas. Sponsored by the SPIE white sands chapter. Seminar proceedings Volume 23 ", year = "1971", note = "1 sv., čet. obr. a foto. v textu", }