[1]
M. Sachanbiński, H. Kóčka-Krenz, J. Skoczylas, i R. Girulski, „Gemstones from the ducal part of the fortified settlement of Poznań (10th/11th century) in the light of gemological studies and micro-Raman spectroscopy”, sa, nr 55, s. 145–169, sty. 2014.