Source: http://www.chtf.stuba.sk/~szolcsanyi/education/files/Organicka%20chemia%20II/Prednaska%207_Derivaty%20karboxylovych%20kyselin_Vlastnosti,%20priprava%20a%20reakcie/Doplnkove%20studijne%20materialy/Esters,%20lactones/Mechanisms%20of%20Lactone%20Hydrolysis%20in%20Neutral%20and%20Alkaline%20Conditions.pdf