Determination of the Optimum Harvest Window for Apples Using the Non-Destructive Biospeckle Method. - Anna Skic; Monika Szymanska-Chargot; Beata Kruk; Monika Chylinska; Piotr Mariusz Pieczywek; Andrzej Kurenda; Artur Zdunek; Krzysztof Rutkowski (Sensors, 2016)