Bulgakov, A V, Mirza, I, Bulgakova, N M, Zhukov, V P, Machulka, R, Haderka, O, Campbell, E E B & Mocek, T 2018, ' Initiation of air ionization by ultrashort laser pulses: Evidence for a role of metastable-state air molecules ', Journal of Physics D: Applied Physics . https://doi.org/10.1088/1361-6463/aac56a