Bulak P., Walkiewicz A., Kuna J., Brzezińska M., Nosalewicz M., Mazur K.:  How exogenous plant growth regulators can improve the process of phytoextraction (2013 r.) III International Conference “Plant - the source of research material”, Lublin, 16-18.10.2013 r. 2013,

Mazur K., Bulak P., Walkiewicz A., Brzezińska M.:  A comparison of two strategies of heavy metals contaminated soil treatmnt: chelate- and plant growth regulators- assisted phytoextraction (2013 r.) International Conference "Protection of soil functions - challenges for the future" in the frame of 7PR UE project "Proficiency", IUNG-PIB Puławy15-18.10.2013 r. 2013, 112-113

Bulak P., Walkiewicz A., Brzezińska M., Kuna J., Nosalewicz M., Mazur K., Kozieł W., Szarlip P.:  The role of beneficial elements in plants (2013 r.) International Conference "Protection of soil functions - challenges for the future" in the frame of 7PR UE project "Proficiency", IUNG-PIB Puławy15-18.10.2013 r. 2013, 110-111