50 years of firn evolution on Grigoriev Ice Cap, Tien Shan, Kyrgyzstan. - Machguth, Horst; Eichler, Anja; Schwikowski, Margit; Brütsch, Sabina; Mattea, Enrico; Kutuzov, Stanislav; Heule, Martin; Usubaliev, Ryskul; Belekov, Sultan; Mikhalenko, Vladimir N.; Hoelzle, Martin; Kronenberg, Marlene (Cryosphere Discussions, 2023)