@article {44293, title = {Ectoparasites of the House Martin, Delichon urbica in western Spain. 133, 41-48.}, journal = {Entomologist{\textquoteright}s Monthly Magazine}, volume = {133}, year = {1997}, month = {1997}, pages = {41 - 48}, author = {Clark,Frank and L. A. Hill} } @article {39592, title = {A study of a population of the house martin (Delichon urbica (L.)) feather louse Br{\"u}elia gracilis (Mallophaga: Ischnocera) in Lincolnshire, UK}, journal = {Entomologist}, volume = {113}, year = {1994}, month = {1994}, pages = {198 - 204}, author = {Clark,Frank and Farrel,J. and L. A. Hill} }