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Hello Prodigal. I think the works referred to is Kierkegaard's ""Two Ages"" or ""The Present Age"" and ""The Moment"". 

For secondary resources, I recommend Bruce Kirmmse's Kierkegaard in Golden Age Denmark, where it discusses his politics; and Karl Lowith's From Hegel to Nietzsche for an explicit comparison of Kierkegaard and Marx.
Cheers,  "