1. 1. Korzeniewski K.: The characteristics of the tropical climate zone. In: "Zarys medycyny tropikalnej" ed. R. Olszański. Publ. WIM, Warsaw, 2006; 9 - 16;
2. 2. Korzeniewski K.: The role of health service in the selection of candidates to military service outside the country. Roczn Sł Zdr, 2006 - 2008, 166 - 169;
3. 3. Kierżnikowicz B, Nahorski W, Morawiec B.: Epidemiological, therapeutic and diagnostic problems with some tropical diseases brought to Poland. Roczn Sł Zdr MW, 2006 - 2008, 171 - 181;
4. 4. Iwańczak K, Klocka RK, Potyrała M.: The incidence of esophageal, stomach and duodenal diseases in children. Przegl Pediat, 1993; 23(3):145 - 150;
5. 5. Ansart S, Perez L, Vegeby O, et al.: Illnesses in the travellers returning from the tropics: a prospective study of 622 patients. Journal of travels Medicine, 2005; 12:312 - 318;