1. On some systems of difference equations
2. On the asymptotics of some difference equations
3. D. Bernoulli, Observationes de seriebus quae formantur ex additione vel substractione quacunque terminorum se mutuo consequentium, ubi praesertim earundem insignis usus pro inveniendis radicum omnium aequationum algebraicarum ostenditur (in Latin), Commentarii Acad. Petropol. III. 1728 (1732), 85--100.
4. G. Boole, A Treatise on the calculus of finite differences, 3rd edition, Macmillan and Co., London, 1880.
5. A. de Moivre, De fractionibus algebraicis radicalitate immunibus ad fractiones simpliciores reducendis, deque summandis terminis quarumdam serierum aequali intervallo a se distantibus (in Latin), Philosophical Transactions 32(1722), 162--178.