These #BoneAwls and other related "Analyses of #Mesolithic grave goods from upright seated individuals in Central #Germany" have been published by J. M. Grünberg et al. in a contribution to an edited volume on "Mesolithic #burials" in 2016:

https://www.researchgate.net/publication/315950179_Analyses_of_Mesolithic_grave_goods_from_upright_seated_individuals_in_Central_Germany