Bulletin de la Société des Sciences et des lettres de Łódź, Série: Recherches sur les déformations (abbreviation according to Math. Rev.: Bull. Soc. Sci. Lettres Łódź Sér. Rech. Déform.) is a refereed academic journal edited at the Societas Scientiarum Lodziensis, publishing original papers in mathematics, physics and their applications connected with deformations of mathematical and physical structures in the large sense of this notion. Almost all papers are in English, but also papers in French, German or Russian may be accepted. Each manuscript submitted is sent to two independent referees and, after that, presented by an ordinary member of the Society at a meeting. The Bulletin has being existing since 1950, and its series Rech. Déform. since 1984. Its volumes, appearing in three issues per year, are widely distributed and available in many complete libraries. The papers are reviewed in the Math. Rev. and other reference journals.