Ahlen, S., Ambrosio, M., Antolini, R., Auriemma, G., Baldini, A., Bam, B. B., … Liu, R. (1992). Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment. Physical Review. D, Particles and Fields, 46(3), 895–902. https://doi.org/10.1103/physrevd.46.895

Ahlen, S., M. Ambrosio, R. Antolini, G. Auriemma, A. Baldini, B. B. Bam, G. C. Barbarino, et al. “Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment.” Physical Review. D, Particles and Fields 46, no. 3 (August 1992): 895–902. https://doi.org/10.1103/physrevd.46.895.

Ahlen S, Ambrosio M, Antolini R, Auriemma G, Baldini A, Bam BB, et al. Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment. Physical review D, Particles and fields. 1992 Aug;46(3):895–902.

Ahlen, S., et al. “Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment.” Physical Review. D, Particles and Fields, vol. 46, no. 3, Aug. 1992, pp. 895–902. Epmc, doi:10.1103/physrevd.46.895.

Ahlen S, Ambrosio M, Antolini R, Auriemma G, Baldini A, Bam BB, Barbarino GC, Barish BC, Battistoni G, Bellotti R, Bemporad C, Bernardini P, Bilokon H, Bisi V, Bloise C, Bussino S, Cafagna F, Calicchio M, Campana P, Campana D, Carboni M, Cecchini S, Cei F, Chiarella V, Chiera C, Cobis A, Cormack R, Corona A, Coutu S, DeCataldo G, DeMarzo C, De Vincenzi M, Di Credico A, Diehl E, Erriquez O, Favuzzi C, Ficenec D, Forti C, Foti L, Fusco P, Giacomelli G, Giannini G, Giglietto N, Giubellino P, Grassi M, Green P, Grillo A, Guarino F, Gustavino C, Habig A, Heinz R, Hong JT, Iarocci E, Katsavounidis E, Kearns E, Klein S, Kyriazopoulou S, Lamanna E, Lane C, Lee C, Levin D, Lipari P, Liu G, Liu R. Study of the ultrahigh-energy primary-cosmic-ray composition with the MACRO experiment. Physical review D, Particles and fields. 1992 Aug;46(3):895–902.