Hi Inconceivable Truth, thank you for your kind words. Have not been online lately and have just noticed your message. As you understand it is a big subject and my own journey has been long and arduous, so it is difficult to name specific books out of all the voluminous material digested as the appropriate ones for you. Leave it with me for now and will PM you when something comes to mind that may be of conducive to your studies. In the mean time please free to PM if you want to add anything.