https://www.sciencedirect.com/science/article/pii/S0016328717301155?casa_token=iKU3XKxO49UAAAAA:gwj6jVmTM3OiPR3ak9pA0XNdiZZq614lvYufz-2MnZkI3iCUrJwRDpBfcTIflbmxTQdjg4x_eJUU 2018 Natural and cosmic Low