Wings, Vol. 10, N° 4, Aug. 1980 (Contents: Aerial Gunpower, A History Of Airborne Weaponry. Is It Farewell To The Hughes Flying Boat ? France's Nieuport Half-Wingers...)
ISO 21501-4:2018, Second Edition: Determination of particle size distribution - Single particle light interaction methods - Part 4: Light scattering airborne particle counter for clean spaces