Fotyma M., Jadczyszyn J., Józefaciuk G.:  Hundredth molar calcium chloride extraction procedure. Part II: calibration with conventional soil testing methods for pH. (1998 r.) Communications in Soil Science and Plant Analysis 16251632, 1998 

Fotyma M., Lipiec J., Naglik E.:  The impact of soil tillage methods on crops yield and soil density. (1997 r.) Bibliotheca Fragmenta Agronomica 1997, 2A/97, 227-230