https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxwcm9pc2hvZGFuYWJ1bGdhcml0ZXxneDo5OThjZTUwZWU5MzI2YWQ
https://sites.google.com/site/bulgariannewhistory/vojnata-na-rusia-protiv-blgaria-v-dobrudza