Erlykin A.D. , Wolfendale A.W. High energy cosmic ray mass spectroscopy I.Status and prospects. Astroparticle Physics , Vol.7 , с. P.1-13 , 01.1997 Erlykin A.D. , Wolfendale A.W. High energy cosmic ray mass spectroscopy II: Masses in the range 10~14-10~17 eV. Astroparticle Physics , Vol.7 , с. P.203-211 , 01.1997
