“…Such a state is called an internal state or a state operator. For detailed investigations, see Borzooei, Dvurecenskij, and Zahiri (2014), Botur and Dvurecenskij (2013), Ciungu, Dvurecenskij, and Hyčko (2011), Dvurecenskij (2001), Flaminio and Montagna 2007, He, Xin, and Yang 2015, Jencová and Pulmannová (2015, Di Nola and Dvurecenskij (2009), Di Nola, Dvurecenskij, and Lettieri (2010), Pulmannová and Vinceková (2015), Rachůnek and Salounova (2011).…”