BohumírJanský,ZbyněkEngel,JanKocum,LuděkŠefrnai inni.The Amazon River headstream area in the Cordillera Chila, Peru: hydrographic, hydrological and glaciological conditions.„Hydrological Sciences Journal”.56(1),s.138–151,2011. DOI: 10.1080/02626667.2010.544257.