Authors’ abstract: “The aim of the present paper is to carry on the research of {\it G. Czédli} [Eur. J. Comb. 30, No. 1, 208‒215 (2009; Zbl 1187.05024)] in determining the maximum number of rectangular islands on a rectangular grid. We estimate the maximum of the number of square islands on a rectangular grid."
Reviewer: Marius Tărnăuceanu (Iaşi)