38. 
39. 
40. 
41. 
42. 
43. 
44, 
45. 
46. 
47. 
48. 
49. 
50. 
ol. 
52. 
53.- 
_Servomechanisms,” doctoral thesis, Department of Electrical Engineering, 
54. 
55. 
56. 
57. 
68;- 
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