Schmidt, N M, Michelsen, A, Hansen, L H, Aggerbeck, M R, Stelvig, M, Kutz, S & Mosbacher, J B 2023, ' Sequential analysis of δ 15 N in guard hair suggests late gestation is the most critical period for muskox calf recruitment ', Rapid Communications in Mass Spectrometry, vol. 37, no. 6, e9470 . https://doi.org/10.1002/rcm.9470 Schmidt, N M, Michelsen, A, Hansen, L H, Aggerbeck, M R, Stelvig, M, Kutz, S J & Mosbacher, J B 2023, ' Sequential analysis of δ 15 N in guard hair suggests late gestation is the most critical period for muskox calf recruitment ', Rapid Communications in Mass Spectrometry, vol. 37, no. 6, e9470 . https://doi.org/10.1002/rcm.9470