Complete hyperfine Paschen-Back regime at relatively small magnetic fields realized in potassium nano-cellA. Sargsyan, A. Tonoyan, G. Hakhumyan, C. Leroy, Y. Pashayan-Leroy and D. SarkisyanEPL, 110 2 (2015) 23001DOI: https://doi.org/10.1209/0295-5075/110/23001