Sunflower Plants as Bioindicators of Environmental Pollution with Lead (II) Ions. - Olga Krystofova; Violetta Shestivska; Michaela Galiova; Karel Novotný; Jozef Kaiser; Josef Zehnalek; Petr Babula; Radka Opatrilova; Vojtech Adam; René Kizek (Sensors, 2009)