Low level image processing using steerable filters
@TechReport{michaelisTR9716,
  author = 	 {M. Michaelis},
  title = 	 {Low level image processing using steerable filters},
  institution =  {Institut f. Informatik und Praktische Mathematik},
  year = 	 1997,
  number =	 9716,
  month =	 {September}
}