Predicting grain protein concentration in winter wheat (Triticum aestivum L.) based on unpiloted aerial vehicle multispectral optical remote sensing. - Wolters, Sandra; Söderström, Mats; Piikki, Kristin; Börjesson, Thomas; Pettersson, Carl-Göran (Acta Agriculturae Scandinavica: Section B, Soil & Plant Science, 2022)