[E. Ranatowski, A. Poćwiardowski: Mathematical Modelling of Weld Phenomena 5, (ed H. Cerjak), pp. 725-742. 2000. London]Search in Google Scholar
[G. A. Korn, T. M. Korn: Mathematics for scientists and engineers. McGraw - Hill Book Company. Copyright for Polish edition by PWN. Part I, pp. 144-146. 1983. Warsaw]Search in Google Scholar
[Benker: Practical use of Mathcad: Solving of Mathematical Problems. Springer-Verlag. Berlin Heidelberg. 1999.10.1007/978-1-4471-0539-8]Search in Google Scholar