Calculation of reinforced concrete ceilings with normal cracks accounting the Chebyshev approximationTaljat Azizov, Olexiy Melnyk, Olga Orlova, Angelina Kalenchuk-Porkhanova and Larisa VakalMATEC Web Conf., 116 (2017) 02002DOI: https://doi.org/10.1051/matecconf/201711602002