Groenendijk, H. A., & van Schaïk, R..  (2021).  Isolated and backward Westerwolde (Groningen, The Netherlands)? A confrontation of archaeological and historical data from the Middle Ages in a wider geographical context. Palaeohistoria, 61/62(2019/2020), 273-344. doi:https://doi.org/10.21827/602fcb755de5e