@book {Valois1881, title = {{\'E}tude sur le rhythme des bulles pontificales}, series = {Biblioth{\`e}que de l{\textquoteright}{\'E}cole des chartes}, number = {13}, year = {1881}, publisher = {A. Picard}, organization = {A. Picard}, address = {Paris}, author = {Valois, No{\"e}l} } @book {Valois1880, title = {De arte scribendi epistolas apud Galicos medii aevi scriptores rhetoresque}, series = {Bibliothequede l{\textquoteright}Ecole de Chartres}, number = {22}, year = {1880}, note = {

преизд. New York s.d

}, publisher = {A. Picard}, organization = {A. Picard}, address = {Paris}, author = {Valois, No{\"e}l} }