А вот материалы американцев:
https://sites.google.com/site/xnarcompetition/
https://sites.google.com/site/xnarcompe ... r-duration
https://sites.google.com/site/xnarcompe ... r-duration
https://sites.google.com/site/xnarcompe ... e-duration
https://sites.google.com/site/xnarcompe ... c-altitude
https://sites.google.com/site/xnarcompe ... port-scale