Search for: [Subject = gravimetric quasigeoid model] OR [Subject = least squares collocation] OR [Subject = GNSS\/levelling data] OR [Subject = global geopotential model] OR [Title = GDQM\-PL13 – the new gravimetric quasigeoid model for Poland] OR [Creator = Szelachowska, Małgorzata] OR [Creator = Kryński, Jan]